If Stagecoach is adding any vehicles to the pool, then it will be vehicles they don't want, e.g. Hybrid Enviro E400H's of which several in the group have burst into flames of which most are at Manchester now. I think there is a possibilty that they may loan vehicles to Metroline, but they probably wouldn't sell E400MMC's or Diesel E400's to Metroline, as Stagecoach have other fleets that they can be used in. Werther the E400 Electrics go over is another matter as Andy Burnham helped Stagecoach obtain funding for them, so there may be some presure on Stagecoach either to transfer them to other depots in Greater Manchester or sell them on to Metroline.
I am sure Metroline would be in the position at least to have vehicles in delivery by January next year. An order for about 300 double-deckers frm split suppliers, would be what we might expect, but that could be reduced by London cast off's, not just from Metroline but from other fleet as well, and sold by Ensign and the like, then there may be other oddities that could be purchased from other fleets for one reason or another.
Wythenshawe depot would be the easiest one to replace stock at for Metroline as its Welsh NAT subsiduary might yeild stock, and there are several E200's and Wright Streetlites always for sale on the secondhand market all the time. Double-Deckers are harder to source, mainly because there are fewer of them with independents and also because major operators just simply do not and would not sell good quality double-deckers.