The Lakers would probably offer him the TMLE which is $5.9m but still a heck of a paycut.
I don’t think he’d get $20m in free agency from anyone though, more likely between $13-16m
Clock is ticking for him however. If he’s really that serious about coming home and wanting the best chance to win a title, the Lakers are most likely his best option.
I'll have to see if I can find it. But according to an article I read, he'd be looking at around $2.7 million. Don't remember what the exact reasoning was, but I know the tax apron was part of it.