Cousins is probably the highest risk/reward player in the league
Far from it.
He's a huge bruiser center who is coming off two straight 20+ pt 10+ reb seasons (in an era where very few players hit those marks), has improved a lot defensively in recent years, and the biggest complaint you can make about him is that he's frustrated with his joke of a franchise losing so many games and changing up the coach so often.
Oh, and his field goal percentage is kind of low for a center, but he also takes a lot of shots with very little spacing or passing ability on the roster around him.
The only significant downside to building around Cousins is that you have to accommodate a guy who wants to take 15-20 shots down low every night, which runs against the current trend of playing an up-tempo, drive-and-kick, perimeter-oriented style. But by the same token, he presents huge matchup problems for basically every opponent in the league.