Well, the simple answer is "no." His career record speaks for itself. Jimmy is an example of a player who wills regular season wins, which is admirable. Only about 5-8 players do that in the league. All the more impressive that Chicago thought it's a good idea to dump a player whose #2 scoring option was 35yo Wade with no knees and #3 was RoLo.
Oh boy there's that Jimmy tangent again.
But the deeper answer is , Zach's developed, and he's been on very bad teams. Make him a 2nd option, or get an actually legitimate defensive team (tall wings and rim protection), and you should be over .500.
I think there is only 1 type of player who will can swing your team wildly in the +/- win column, and it's a two-way wing who can create plays. Kawhi, Durant, Lebron, Luka, Harden (ok perhaps a knock on defense but he makes up for it with his 25 FTAs), Jimmy, George (though PG's injuries are piling up). Am I missing anyone?
At their best, a Westbrook/Paul/Curry/Lillard/old-Rose can lead a charge, but they really need help from defensive big men, wings and coaching. Anthony Davis could hardly do it. He was sub .500 without Lebron, or without Jrue/Rondo/Niko stepping up.
I consider Zach a small guard. He's not as short as McCollum, but he doesn't have that wing-span to make defense and paint scoring easy for him. He needs to rely on acrobatic athleticism, and his instincts aren't good. If he had passing skills he'd be a special player, but still, that's why I think he's in the same boat as Mitchell and Beal (with worse defense and playmaking). Without good teams, neither these guys win -- sure helps to have Gobert, vets, coaching and depth. Or in Beal's case, that Wall/Otto/Gortat team wasn't exactly a push-over.
You need to build around a wing. Zach is certainly a 'building block' at this point, just not the center point. I wouldn't give him up (unless it's for an all-star wing), because you need somebody like him to help that wing. That's why you give up your over-hyped big men when their value is high (or don't draft them to begin with).