I don't know why you keep focusing on this, the problem isn't that OKW beat USF for the 5 first minutes, it is that USF is design to beat their opponent during that time or they lose. USF isn't design to perform comeback unlike Ostheer is.
Now this is a load of bullshit. 5 minutes will not break the game for USF. Then how does Ostheer deal with it's disadvantage vs USF for the first FIFTEEN minutes? How does Ost have better comeback mechanics than USF? How do u get the fuel for a panther when the USF player is dominating you hard, you'll be stuck with tier 3 units which are hardly "great" late game units. If USF lose a rifle squad late game, they can double upgrade with bars and compete with veteran infantry, are non veteran axis infantry as effective vs veteran allied infantry? No because you can't double upgrade.