Now I know you are Cicero, and upon this rock I build my faith.
I don't know what Greek scholar told you that, but they're full of baloney. The Greek manuscripts have no capitalization (and no punctuation, either) so any argument based on capitalization goes nowhere.
Here, let me help you out. The usual claim is that the Gk for "Peter" (Petros) and the immediately following word for "rock" (petra) mean something different, because there are a few examples of "petros" in classical Gk poetry (but none in the NT) which mean "pebble".
The argument is bogus because Jesus is forming a masculine proper name from "petra", a noun with feminine declension. He had to call Simon "Petros", or give him a woman's name. All the Petros/petra change proves is that Peter was a man.
"Cicero" comes from the Latin for "chickpea". "Now I know that you are 'Chickpea', and upon this rock I build ..." Huh?