Ok.. Total make over going on.. Have some Q’s for opinions..

Ok.. As I’ve posted before, I’m installing solid motor mounts.. Finding out the hard way that pulling the motor is how it has to be done.. If not and anyone else has done it with out pulling the motor please advise me how..

Anyway, I changed my through shaft seal, #1 will the front axle spin separately from the rear axle?
#2 I believe the front through shaft is bent slightly, I spin it and it looks like a slightly bent pool stick when you roll it across a table. So do I need to replace it? If so how complicated is it?
#3 how much play should the rear pinion have? When I had the seal out, I was able to move the pinion slightly up and down and in and out.. Does the bearing need replaced? The front pinion has zero play, that’s why I asked..
#4 if I can’t get the motor out.. Would just replacing the top motor mount with a solid one do the trick? I ask because the oem mount was completely broke.. When I to the nut off all 3 bolts for the mounts, I could move the in every direction.. That a sign that they’re all bad?

I want to kind of over haul my bike and do it as right as I can so in the future I have less issues.. Also figured I would because it completely apart..
If there’s anything else I should check/replace please let me know..