What you just described is not Danny Green though, who is an ELITE shooter, who had an established track record of winning basketball at the highest level of the NCAA, and who actually played near-elite defense. Oni's SOS in college was NEGATIVE, but more importantly, in the NBA he has been reeking dog ****. These are not comparable players.
But honestly, we're talking about players that should only see the floor in blowouts so it's whatever. But Exum can at least defend at an NBA level which is more than can be said of Oni. Or at least he could. He also demonstrated good lob chemistry with Rudy.
Do you understand how bad a basketball player has to be for me to make a comparison that is favorable to Dante Exum?