Welcome to the site, Al. I see you are a very experienced cruiser. It's great to see you posting
I was also wondering why another ship wasn't sent until I heard someone on the news say that it would have been more dangerous to move all those passengers from one ship to another while at sea . The person said that there were too many variables - too risky , too many things could have gone wrong with that, too dangerous .
I think that Al, above, has hit the nail on the head regarding redundant power. You would think that there would be another way to power everything just in case of emergency. When they build these ships, don't they prepare for " what if" situations????