The only reason that the B1G was able to pull USC/UCLA and now Oregon/Washington goes back to the PAC12 not getting distribution on Direct TV and not willing to partner with a traditional sports media partner (ESPN/FOX Sports) in formation of the network. The current state of the PAC 12 dissolution goes directly back to those decisions.
I think those facts undercut any potential B1G Antritrust arguments. Plus if you can’t get a good enough deal to get a GOR signed (months if not weeks ago), that isn’t the B1G’s fault.