What is this defensive prowess? His defensive skills can be summarized as helping rebounding and gambling for steals. His lateral movement is poor (and he's young), he's not athletic enough to contest anything at the rim, he's not a physical player. He isn't stopping anybody off the dribble.
Who he can realistically guard at the SF position and give you an advantage? (he can't guard any of the elite at PG/SG) Lebron? Paul George? Kawhi? They eat him for breakfast.
Because he is, at best, an above average defensive player (he isn't IMO, but let's pretend), he has to contribute *something* better than a rookie on the other end. Especially after years in the league, you would think he figured out his niche on offense.
Bowen was a solid defender, BUT he also had a 3 point shot. Same with Danny (for a while anyways).
I understand that for the average Spursfan, if you put Belinelli next to Anderson, Kyle looks like Ron Artest defensively, tbh, but realistically, he's an average defender, and why would the Spurs spend that kind of money on average?