I am still trying to figure out whom this might be referring to.
I cannot think of any single Autobot with enough combat power to fight a Combiner on equal terms.

I assume it is unlikely to be Omega Supreme or Galaxy Shuttle, since the game engine does not support adding a megabot as a team member.


The only combat power bot they've added so far is this guy, an ingame cutscene has him fight six Seekers alone and win.
They literally retreated because they wanted to stay alive!