Sorry, what's your point, then? The 'Thunder Model' is accumulate a mountain of draft picks, draft better than everyone, let them play, and then hope your players are in the conversation for the best at their position or at least best at an important skill (Ibaka, shot-blocking/defense). The 'downside' is that the market basically won't allow them to keep all of their favorite players. Half the teams in the NBA don't have even one of those guys. OKC lost one, but didn't lose him for nothing and in fact got a pretty nice haul in the process .
There is no downside to having 'too many' good players.
One bad contract and you yada? That's precisely the problem OKC didn't have. Perkins is their worst contract and he's a good player. Paying Harden $60/4 if he even just stalls at the player he's been is worthy money, without respect to the cap situation of whatever team. But if you don't want to pay that much for a player, you can parlay high market-value and OKC did exactly that. And probably could've at the end of the year as well.
There is no downside to having 'too many' good players.