Originally Posted by AVEITWITHJAMON
I'm not messing with you at all, there is obviously something special about Optimus, this was true in the cartoon's as well, people looked upon him with awe, and very rarely was his leadership challenged (Grimlock being a sole exception), its the same in the movies, people regard Optimus with awe and respect, even humans. Its totally possible that is simply the 'good' that Prime's exude that is the downfall of The Fallen, who turned to dark ways.
You still haven't answered the question. I never questioned his leadership, but why he can defeat the Fallen because he's a Prime. From what we've seen, he doesn't have the abilities of the past Primes. So anyone strong enough could defeat the Fallen.