Ok, i have found out how to get each Concurrence to occur. For Inferno, just use 3 level 1 Quickenings. Torrent is 3 level 2 quickenings. Cataclysm is 8 level 1 quickenings. Wind Burst is 6 level 2 Quickenings. Whiteout is 5 level 3 quickenings. Ark Blast is 2 of each Level 1, 2, and 3 quickenings (in other words, 6 quickenings minimum). Luminescence is 3 of each Level 1, 2, and 3. Black Hole (the one that roadkill needs) requires 4 of each Level 1, 2, and 3 quickenings (this requires a 16 chain, so i guess i got it with 16).
7onewingedangel7, 14 isn't too bad. That's a good amount. Most I've had was 26, although one time, I had just Fran and she used 12 quickenings by herself (which saved her, cause she's only level 20 in my game, i don't use her).
sig credit goes to Craizen
Resurrection in process:
Final Fantasy Eternal