He looks like a deer where what you see is what you get.
Yes, he put on some inches this year, but to me he doesnt look like he has the making to be a super giant, maybe add another 10 inches next year. Heck, maybe lose 10 inches. Based off of one picture, he just doesn't have the look.
So if he meets your standards this year, I guess I don't know what good letting him go will do... But if you kill him, neither will you.