That establishes prior art for X, but X+2 would still potentially infringe on X+1 and they'd have no leverage for negotiating a license. Except they're still on

That establishes prior art for X, but X+2 would still potentially infringe on X+1 and they'd have no leverage for negotiating a license. Except they're still one of the biggest patent spammers, so they probably do have leverage in the portfolio somewhere.