Implied power wont work with the Superman camp here. You better have a concrete feat or its an easy win for Superman. I dont buy the weakened Surfer theory either, but its here nor there. I will never believe that Superman (even with Adam) can beat the Runner.
Its a shame that Marvel allowed Gruenwalds silly story to even be published. All he was doing was stroking his love for Barry Allen (Buried Allen, yeah takes a real sleuth to figure that out) and low balling the Runner in it. I hold that story with about as much faith as I do a story like She-Hulk beating the Champion cause she worked out, or Spiderman beating up Firelord. Yeah, it was good for a laugh or two, but everybody should know better.