They'd essentially have had to spin one whole cluster's worth of stations. The cap for one owner in Buffalo is either seven or eight stations, with no more than either four or five on one band. (I think it's 7/4, but would have to do a little research to be sure.)
I'd think the must-keeps would have been WGR, WBEN, WYRK, WJYE, WTSS, and either WKSE or WBLK. KB probably would have stayed, and you'd have a spin-off cluster with WBUF, WLKK, WWWS and either WBLK or WKSE.
But that assumes that the goal is simply to create the strongest possible cluster for the merged company, and the politics don't always work that way, especially when revenue caps are figured in. Getting Justice Department and FCC approval for a merger like this is often easier when the spinoffs include some stronger facilities, so it's entirely possible that a WJYE or WTSS or a KB might have been among the spinoffs, too.