[@Riddle Me This] Glad to have some interest already!

To answer your question, if the number 1 spot were to be filled by someone whose [i]only[/i] advancement was within their physical strength, I'd say that levelling a decently sized building wouldn't be beyond them. Think Hancock, minus the flight. Though I imagine that enhanced strength could be used in other ways, such as being able to wind up a punch so strong that hitting the earth would cause earthquake-like tremors. There is certainly a limit to just how powerful a Child of Eve can be, but it's a pretty high one. In my mind, 'overpowered' would involve something like being able to kill something just by touching it.