Originally posted by ODG
Because Superboy Prime wasn't holding back anymore, per his own words, which applies to the three times he fought Conner outside of the initial Smallville ambush. That conversation/revelation is the same one as Conner holding back. Reread Infinite Crisis.
I also remember a conversation where Prime confessed to not even trying when running through the JSA, Teen Titans etc. too. Now Conner is supposed to be some kind of major threat? Nope I don't think so....not even to a holding back Prime.