You provided nothing besides saying "he's better, I can tell". Zeller's defense impact alone makes him far better than a green player with 0 games played. Frank might be better one day (I really doubt it, personally), but there's no way in hell he is right now.
I really don't get why people think DeAndre is such a great defensive player. He is decent defensively. He blocks shots decently and is a very good rebounder. But he gets beat on rolls and gets lost fairly regularly.
Batum won't get a max deal. He is a veteran, his max would be the same as LeBron/KD. He will get PAID but not the max. And why wouldn't we pay him if he's good, we literally only have Kemba and the rookie scale players after this season. Paying him and MKG would still leave us with a ton of space.