Andersons got some of the best footwork and head movement in combat sports period. Sure the guy doesn't get hit as often as other guys but to be known as a striker and be as successful as Andersons been with his striking I find it hard to think that the guy has a glass jaw.
Silvas got a great Jiu-Jitsu game but he really only uses that as a defense mechanism if he gets taken down. In many of his fights he could have taken the fight to the ground and submitted people with a relative amount of ease. Fact is, the guy wants you to eat leather, elbows, knees and his shin.