playing the game the other night with a friend of mine (he'd recently gotten the game and Season 1) we played a game, and i figured since I SO enjoy using G-pa Legacy(Or America's Greatest Legacy as it's actually called) we'd go through a game to get him unlocked. we played through 2 games using the same team, Crono Ranger, Fanatic, Expatriat, and Tempest, obviously against Ambuscade in Silver Gulch.
Problem is: the first game we defeated him, one of the characters was at 9 HP, everyone else was below but still functioning: no unlock. i figured it was because i had put together the game. so we did it again, this time with him being the game put-togetherer person. again, defeated Ambuscade, noone was even at 9 HP, everyone was below but still alive. again, no unlock.
he'd gotten the unlock today by himself, which made me think MAYBE it was just because there was multiple players in the game? I'm not sure, but i'm wondering if that's not an issue i may or may not have to look out for with later unlocks?
if it helps, i had already unlcoked G-pa Legacy, but we'd been in games before where he got an unlock i had by being the player in control of that particular hero...