I thought roster changes were coming. Hence the reason why they're playing with sixer and xms at the next event or whichever it was.
U don't really need to play MDL season if u relegate out from epl if there is no promotion so technically they could be back to MDL next season (VP did this befor xd)
There is no Promotion into EPL this season, so there is no reason to play in MDL besides practicIng. Though I think when you decide to not participate you should be auto-relegated into the next lower tier.