I reckon agility is pretty key though for a player that height. Mihocek succeeds because he is smart and moves well.Mitts Morris top of the list. Not worried about his height. A couple of cms isn't a deal breaker (just look at Brody Mihocek). Especially how well he reads the flight of the ball, one grabs it and most importantly has huge core strength to protect the drop zone. At worst if he doesn't make it forward reckon he'd be a ripper intercept defender.
Bigger (only) question mark is his agility. But if he had that he'd be gone first round.
you may be right about being a good 3rd/4th tall defender though if the forward line doesnt work out.