That doesn't really answer it though, I appreciate what your saying but are you denying they had a similar or Rooney higher than CR touted potential when they joined in 2004? I don't think there is any argument who turned out the better player... but who looked like they had more potential? It has to be Rooney...
It really didn't. The English press were more excited by Rooney as the great white (Pele) hope and he was a proper English-style talent. Jumpers for goalposts, runs all day, big lad with skill - he was Roy of the Rovers and younger (and tactically better) than Ronaldo.
Ronaldo was a different kind of talent. George Best said, "Everyone went crazy over Wayne Rooney, but I get more excited by Cristiano Ronaldo." I agreed with George but we were always a minority back then.
The question mark over Ronaldo was whether he could do find a way to use that talent for United and it took him a while but he got there.
The fact remains though if you look at who had the potential to be the better long term talent for United, it was Rooney, because Ronaldo buggered off.