How does cid make power?

Ten pages trying to convince a member that two plus two equals four......

What I'm trying to get at is the conventional wisdom here is if built same/similar the larger cid gonna always make more peak and under the curve hp and if this true I can't see what stopping the smaller cid spin up to catch up and make similar power since the top end is obviously capable of ir. Everyone says it obvious and been explained to me a million times and I must be really dumb cause I haven't seen it or get it.