Sudden aggression from otherwise passive players is almost always a sign of strength, hand #1 seems like a fold. not that seeing the results makes it any harder .

#2 since he is in the blinds as well there is a good chance he is CR'ing you with lower 2 pair. I would re-raise him on the flop pretty big here. If you decide to just call on the flop I will put him AI on turn given his smallish stack.