He didn't beat any of those QBs - the two of them were never even on the field at the same time. His offense beat those guys' defense by more points than their offense beat Weeden's defense.
A victory over an average QB with an elite defense would be a bigger indicator of NFL success than beating an elite QB with an average defense. It's a facile comparison of Gruden's which appeals to egos but has little relevance in a team sport that pits offense against defense.
Weeden beat most of the teams he played, against high ranked teams with talented QB's, what more do you want? he cant control what teams he plays against. I understand that Weeden had Blackmon but Luck had Coby Fleener and RG3 had Kendal Wright. I like Weeden, he's a winner