Does Johny Hendricks have a suspect chin?

Before UFC 171 I went back and watched a large majority of Johny's old fights. I was shocked to see that Johny was rattled in more fights than I thought. He was rocked in his fights with Pierce, Grant, and Condit. I also heard he was KTFO by Phil Baroni in training.

Once again this last Saturday night against Lawler, Hendricks was hurt badly. As a Hendricks fan this is really considering. I think against some of the harder hitters in the division he might get exposed.