As a kid, I loved sci-fi movies, as bad as they were in comparison with today's films. I generally watch them on YouTube and sometimes on Netflix. YouTube could have several different posts of the same movie by different people. As for my favorites, that's hard to say. I like "When World's Collide," and that line was used on a Seinfeld episode when friends from two different segments of a character's (George?) life met. I also like "When the Earth Stood Still" and "War of the Worlds" - "Invasion of the Body Snatchers." I'd better stop here, or I'll be adding titles all day.

One prime mover, one propeller, very common on vessels that size and category.

Looking at the publicly available videos of the movement leading up to the resulting crash, in all their weaknesses due to camera distance, available lighting, camera viewing angle, etc, there is something else that arises as a question, and I keep genuinely hoping can be determined and publicly reported.

Just going by the low level of being able to determine detail in those videos, it appears to me that ship made a more rapid course change than would be expected possible by use of rudder control, especially in those conditions. After there was an initial course change, the ship does not appear to continue in a turn, but takes a rather straight course in the new direction.
Now, if that course change is more rapid than the rudder can produce, I am highly interested in knowing if it can and will be determined if there was any contact with the bottom or an unknown obstruction on the bottom that deflected the ship to the side that way.

Wind above the water surface? ........well, maybe.......but, still what appears to be a too rapid course change. If the online places that report conditions there are correct there was a six mile per hour breeze at the time of the incident.
The videos don't seem to show more than a rather gentle ripple on the water surface.......six mph seems reasonable.

Nope. Rudders do not produce thrust. No different from a gliding airplane. The boats rudder works by causing a reaction to the fluid moving on it. It does not matter if the rudder is going through the fluid or it is steady but fluid is flowing around it, you get a reaction. That was its designed purpose.

Since the boat is moving forward, the rudder will still have effect. Only diminished in effectivity, because water flows faster on it when the propellers are working.
Only when the boat is drifting, when the water and the boat is moving as one, will the rudder be useless. The boats mass, for a short while, made that drifting non-factor. It was still cruising forward.
I'm hoping that investigators do find the problem and have it mitigated.

I got one, and it was a disappointment. It requires an app on the phone, and I don't have it. I don't know if I lost the instructions for downloading it, or what, but I can't use it.

You want one with a light that you can turn on and off and adjust the brightness. You should be able to focus it. I've seen some that have fixed focus, and unless it's 1/2", or whatever, away from the subject, the image won't be in focus. There are several endoscopes available on Amazon with a wide range of prices. A unit that can save images would be nice. I suspect that a good, usable endoscope would be justifiably expensive.

These links are ridiculously long, the first one, especially!

https://www.bestreviews.guide/borescopes?origin=google&google_params[matchtype]=b&google_params[network]=g&google_params[device]=c&google_params[creative]=664361368035&google_params[keyword]=borescopes&google_params[adposition]=&google_params[adgroupid]=63776168352&google_params[campaignid]=1652855242&bs=&google_params[feeditemid]=&google_params[targetid]=kwd-11185571&google_params[loc_interest_ms]=&google_params[loc_physical_ms]=9004811&google_params[devicemodel]=&google_params[target]=&age=others&hhi=High&dest=0&sys_id=0|678&origin=google&google_params[matchtype]=b&google_params[network]=g&google_params[device]=c&google_params[creative]=664361368035&google_params[keyword]=borescopes&google_params[adposition]=&google_params[adgroupid]=63776168352&google_params[campaignid]=1652855242&bs=&google_params[feeditemid]=&google_params[targetid]=kwd-11185571&google_params[loc_interest_ms]=&google_params[loc_physical_ms]=9004811&google_params[devicemodel]=&google_params[target]=&dest=0&sys_id=0|678&gclsrc=aw.ds&gad_source=1&gclid=CjwKCAjwtqmwBhBVEiwAL-WAYQvqlpk2r_wZdyZGi4ZvOtX8jaqFTIX_PMIsrTYxWFc1DplyiHqvyxoCVKIQAvD_BwE

https://buyersguide.org/borescope/t/best?Country=US&m=b&d=c&c=650921805551&p=&oid=kwd-10204701&lp=9004811&li=&nw=g&nts=1&gclid=CjwKCAjwtqmwBhBVEiwAL-WAYUZfnYsDzmWm50jDzAHbFX2-owdcaLlc9ZspkMeKdcq8DGb1xJcXnBoCgjIQAvD_BwE&tdid=10397064&gad_source=1

EDITED: The ones that auto focus cost over $200. https://www.amazon.com/dp/B09N8HSSW1?tag=bg1-806422-20

Makes one think. Who in his right mind would make a multi million dollar boat that can't be steered once the power is out, and make the steering worked only by one engine? That would be gross negligence on the designer, or gross negligence on the operator/owner of the ship, if they allowed it to travel with only one its system working.

As for the captain to overrule the pilot who was managing the emergency, well, the pilot was there for a reason. He was the captain at that moment. There is much to dig on that event that I'd not call it an accident, just yet.