Re: Aikido does not work at all in a fight.
If someone grabs your wrist, there's a good chance a punch with the other hand is coming next. And so the initial move is intended to disrupt that punch. If they can still hit you with the other hand after your entry, then you did the initial move wrong and trying to apply a technique from there is pointless.
If your technique only works on someone who leaves their arm hanging out there to manipulate, then you probably need to spend more time worrying about controlling their body movement.
If you're looking for logical discussion (of anything) on YouTube, you're wasting time that would be better spent seeking out better in-person teachers.