He still beat grundy.
That's just the way it is.
It's clear hourman in the show is really powerful as well.
Keep in mind stargirl was beaten by shiv,and guess what happen later?
Stargirl beat shiv.
I never mention anything about the cgi.and justifying the bad cgi on grundy by saying its the best looking grundy is pretty low bar for being entertained...
Looking at Earth 2 hourman's power level he would have beaten white superman,prime earth and earth 2 kal in a fair fight as well.From those pages the writers apparently made the black superman a wimp....which isnt cool on many levels.