Cascading any /raidinfo instance

Guild A is a 200+ member guild that frequently kills off MC.

Guild B is a small guild, @90 players, but can only field @20 people per raid.

Guild A offers Guild B a chance to kill the first 2 bosses in MC - Guild A will fill the raid out and add /recruit 15 other people and supply 5 "knowledgable" escorts to get it done.

After the 2 bosses are done {Luci/Madg} group leadership is passed to one of the 5 Guild A members - and 35 people disband. At this point the group raid is reformed with 35 new Guild A members to continue offering more chances at the last bosses/loot for Guild A member.

Cascaded instances do not save you to them because they are expired yet they still have loot tables.

Hrmm, I guess I'm having trouble understanding this.

It was my understanding that once you kill any boss you are than saved to the raid instance. How exactly is the above cascading?

this worked before the raid calendar, its kind of hard to explain but basically say you started MC on a wednesday and it reset on tuesday. say another guild starts MC on thursday and it resets on wednesday. you get 1 friend saved to their instance. after clearing your MC on tuesday, your tag would reset, and you could join your friends instance and clear that instance by wednesday. then you clear mc again on thursday. thats 3 ragnaros in 3 days. but it was fixed