Absolutely would take him, but I also don't think we can afford to move any big men in the deal.
Gay has a long standing curse of being paid a ton of money on lousy teams, but the stories of his awfulness are overrated. For his career he takes 15 shots in 36 minutes. He's an average defender who can get you 20 points on 15 shots every night, plays 2 positions, gets to the line for 5+ freebies, stretches the floor, and isn't *that* much of a black hole (~3apg for a few years now). As much as I like Jerebko in stretches, Gay would be a clear upgrade who would also help keep Crowder healthy and keep us out of Smart-as-a-wing type lineups.
There's also the Stevens factor- having the option to start a guy like Gay at the 4 against certain teams is a good chess piece. When you're starting Amir, the other squad doesn't really have to worry about defending the 4.
Amir + 1st + 2nd for Gay + Cauley-Stein?