Cody's been losing steam since the PPV, he shouldn't be losing again yet. Darby is cool but nowhere near ready for a main event slot. He'd be ideal for when they introduce a mid card belt.
Whatever happens, it's all in the follow up. Private Party beating the Young Bucks might as well have never happened. If Darby is gonna win (which he shouldn't) they should be using it to build his character. AEW seems to treat everyone like Buddy Murphy. Give someone a big time match to shine, then have them disappear for weeks, only to return with no promos, no focus, nothing. By the time they're back on Dynamite the rub is all but gone.