I agree as far as a tare down goes. You are this far into it, might as well finish.
That way when you are done, you know exactly what you have and you also know the sludge trap is not plugged solid.
Just the side to side comparison in your video would make me want to investigate. The timing side looks OK, the drive side is much different. That amount of wobble has to come from somewhere, and its obviously not the bearing sliding side to side on the journal.
Assuming a PO didnt do something stupid, you have a lot of clearance somewhere on the drive side. Pulling up on the rod might show you when something is completely shot, but your not going to feel a few thousandths extra clearance especially if its still cushioned by oil in the bearing.
Taring it down costs nothing but time. After its apart is when the bill starts to roll!
But I really believe not looking into that will cost much, much more later.
Lee