What you need to do in the Big Band matchup is hover around in the air outside A-train range (you are Valentine, you know full well how easy it is to stay in the air with her) His (extremelty risky) "neutral game mixup" (which is more like pressure than mixup because you can react to every option other than A-train easily) just plain doesn't work in that space. Although you don't really have any annoying assists at that range, it does mean BB has to either approach or use his own assists to annoy you. You are only vulnerable when you are on the ground, watch out for BB's options and when he does something stupid like HK giant step, approach at the speed of Valentine and punish him, if not a straight up counterhit, then with pressure. Here's a little secret, Big Band actually doesn't like being pressured, not at all. He is so huge, he is susceptible to instant overheads and all kinds of stupid pressure that wouldn't work on any other character. He wants to get the jump on your approach, he is defensive in that he wants to counteract your offense with the correct defensive action, not that he wants you on top of him. When you are on top of BB, the momentum is heavily in your favour. SSJ is a threat if a good DHC is sitting behind him, but if not, on block he dies, on hit, you end up FULL SCREEN back where BB can't touch Val. EDIT: So basically, you want to slowly edge him towards the corner or make him use a stupid move/ approach you allowing you to punish/pressure him.