Melo does not have the fire to compete for 48 minutes on both ends
Players who do, don't just rely on scoring to make an impact
They defend, board or do something that gives their team an edge outside of scoring
Of course Melo is not the teams biggest problem. No one said he is. But not a single team with Melo as its best player will be a contender or even a playoff team. That's why the teams that want to trade for him won't even offer their 3rd best player. No Blake. No Love. Teams want Melo as their 3rd or 4th best player in an Olympic Melo role.