Bear in mind that I didn't bring up the comparison.
Scoring, consistency and general dependability, rebounding. Hayward is all over the place from game to game to the point that he can't seem to retain a role on the team. I know some people almost make a living out of excuse-making, but he hasn't been able to be relied upon for almost anything despite stretches of tremendous play in a lot of facets. Rush is strictly 3 and D (and coming of an ACL injury), Marv's ghost-like presence makes AK at his worst blush, and Jefferson hasn't been good in 4 years.
Not everything is a matter of apples and oranges. Sometimes it's okay to just say that one player is better than another, and that's not hard given the field above versus a very productive, versatile, and consistent player that happened to be the 2nd most important player on a decent team.