Because at Marinford, Aokiji froze Jozu's arm and it shattered into pieces when he fell to the ground.

I would say they are evenly matched.

Jack's attacks don't do anything to jozu imo, he also has better feats than jack.

I'd say jozu

Jack seems more defensive based as in he tanks A LOT of damage. Jozu seems more offensive based. But haven't really seen enough of him to know

Bruh jack can do damage to him he’s not that tough

I'm sure he can. His name is Jack the drought. Although so far he's been used kinda like a punching bag except against fodders

He is diamond.

Jozu < Doflamingo < Jack

Except we're not even sure about Jack vs. Doflamingo. If Marco hadn't appeared in late series he might've easily been dumbed down much below King.

All jozu can do is slam his hardened diamond into people. His attacks are powerful but the diamonized area that he hardens remains stationary which is a massive drawback. Jack has quite high durability so i don't think that getting slammed into is enough to win the fight. I think jack takes the cake here.