Overeem seems a very legit 6’4” IMO.6'3 seems fair to Overeem. I'd say just under. You can look at pictures with him and Bob Sapp to illustrate that. Or, look at the respective staredowns of Ngannou vs Arlovski and Overeem vs Arlovski. You'll find that Andrei is the same height as Ngannou but clearly taller than Overeem.
Point is, Ngannou is the full 6'4 and Overeem is not. Combine that with a longer reach and a 20lb weight advantage, Ngannou is considerably larger.
Beat the shit out of? Come onSame thing was said when he beat the shit out of fucking Yoel Romero.
It's slight, but you can find photos of Reem being noticeably shorter than Francis 6'4, Werdum 6'4 and Arlovski 6'4. Yet he's taller than JDS 6'4.Overeem seems a very legit 6’4” IMO.
UFC heights and reaches are very sketchy and untrustworthy, but I think Overeem’s is accurate enough.