Kuminga averages just 12.2 points and 5.6 rebounds per game. Although he is still early in his career and has likely not yet reached his prime, his current stats make this contract quite reasonable. In cases like this, players are better off not being greedy; otherwise, they might end up with a minimum contract, or none at all.
It might be that they are testing his potential as to what the picture will be with him and Anthony Edwards. Yes he just average 12.2 ppg because he was not given enough playing time by the Atlanta Hawks as they have a lot of players with similar position.
And now that Naz Reid has been traded, perhaps the Timberwolves needs another scorer and they think that Kuminga could be that guy. He is still sharpening his skills and could still has a lot of potential and bright future ahead with the Timberwolves here.
Kuminga can go off. He has hit 30 points in a few games while not being a teams number 1, that's hard to do when you're not the primary scorer on a team and basically a role player.
They give him enough opportunities and he can deliver. I'd like to see Edwards get deep in the playoffs this year personally, this may be the piece that he needs to get him there.