Darkseid's also got an ego.
I do remember the points you're bringing up. But what if Orion hadn't blocked thw Omega effect, as Darkseid planned?
What's more reasonable, that Darkseid was actively trying to lose in a match that laid waste to a good portion of Apokolips (That final rush created an explosion like something out of Dragon Ball). Or, that Darkseid was playing a Xanatos Gambit?
As TVTropes puts it, a Xanatos Gambit works like "If I win, I win. If I lose, I win.
And ftr, David Xanatos lost many a fight to Goliath.. Not one of them did he give away, but every single loss was set up so a loss lead into another plan.