Just look how Utah is utilizing Kincaid and Kuithe? "But we have fantastic receiver?" Yeah... One who's been out all 3 games of the season, and one who's been out for 2 of the 3. Sure, Chase has played really well, but football is about mismatches. Rex and Holker are walking mismatches over the middle, and we're not taking advantage of that.
Does it justify his leaving? No... I don't think anyone should quit mid season, but I understand why he's frustrated.