If he really plans to delay the debut of whoever doesn't win, then I think the older group should debut first. Then the younger group can debut like 2 years later. Honestly though, it does not at all seem like a good idea because he's trying to build the same type of anticipation that SM did for EXO. Getting the public to know the members before they actually debut. But it's gonna be a missed opportunity cause both groups will develop fanbases and then one is gonna go nowhere.
EDIT: Or, alternately, debut team B, keep KSY solo, and, uh. Maybe let the other 4 be their own group.
OR, plan C, which he really should have looked into a while ago: his company clearly has a capacity for success beyond just his capabilities as a one-man operation. Look into extra management, become a conductor figure with veto/input power, and debut everybody. It's a win/win/win.
