You are aware that baserunning is more than stolen bases?It's pretty simple: Betts has long been thought of as a "5-tool" player but last season his stolen base numbers dropped to 16, so I think we can safely subtract "good baserunning" from his set of tools. As a result, he is now a 4 tool player. Defense is one of them; one divided by 4 is 25%. If he can't get his average back above .300, we'll ahev to downgrade him to a 3-tool player.
You also are aware that 16 SB had Betts at 10th in the American League?