Kind surprised, but not really.
While it’s much more likely that Cousins is nowhere near the player he once was and/or his character brings more burdens than benefits, like I said for GS at that price it’s worth the risk, as you could always cut him if things didn’t work out. And neither Boston nor GS really *need* him, so definitely a risk worth taking.
Hopefully it doesn’t work out for GS. I think people are overlooking a pretty poor fit there, too, similar to how he’d be in Boston.