Hmmmm, riddles seem to be getting less people trying to solve them these days. Guess I'll have to reveal the answer too.
As I said several times the fact that there was only three FFs and not for plot reasons was important. Three consecutive FFs aswell. The link, multiple discs. Obviously more needed, but that gets the answer.
A fallen ally then a fallen enemy, (Aeris, then Jenova)
Falling allies then fallen enemies. (Big clue with falling, parachute drop then Proud Clod, Hojo etc.)
A fallen leader but not for long, (Squall's recovery from Edea's ice attack)
Three then fall but is one gone? (Edea, Seifer and Rinoa who goes into a coma)
Four shall fall if four are there, (Beatrix wipes ut your party, but Quina isn't neccessarily in it)
Just who falls next and should we care? (So end of disc two, FFIX, the answer is Brahne)