On the face of it EZY taking over MON would make sense. easy are on pretty much all of Mons scheduled routes so would immediately increase their market share and take all their slots, and gain an instant big presence in BHX. From next summer Mon fleet is only A320/A321 so no issues with crew compatibility/retraining.
The Mon DB pension scheme liability would be an issue for easy. However, if the Mon turnaround works and Mon maintains/increases market share then easy would have to engage in a price war to squash Mon which together with the lost extra profit from the extra market share from buying in now may cost more than the scheme contributions (drip fed over many years) would. If Mon is later floated for a big investor profit easy may regret not buying in cheap now. Of course, if the turnaround doesn't work they'll pick off the remains for free, but with competition from other airlines that won't be as big a piece of the pie.
So I guess it comes down to how likely easy think the Mon turnaround will work.