My friends and I have been playing it like this from the get-go and haven't had any problems with it at all.

I would assume that if they didn't want the Space Marine to have the "Final Epic Push" turn, they would have written it in reverse... with the command-point-check BEFORE the win-the-game-check.

The game is over after the check...
when someone wins at Monopoly, you don't roll the dice to see if they'd lose after... they already won.
when I bluff you off a pot in poker, you don't flip my cards over to see if I won "for real"... I already won.

It's not unbalanced, it's flavorful, and (more importantly) it's the way the rules are written.