It's hard to say that he's struggled with wrestlers when he's finished every single one of them though.
Well everyone since Jeremy Horn IIRC.
Rashad is good and i'd love to see the fight more than I would Weidman at this point but I believe he'd get put out in the 2nd round.
Hendo took him down and stole round from him before coming out looking to strike in the second. Chael completely dominated and while he did get tapped at the end, Rashad's BJJ is just better than Chaels. Chael seems to love getting tapped out.
I can't say that if Rashad was in the position Chael was in that Silva would have a belt anymore.