This was something I thought would add an element to the game.
When you get knocked in the air, or are rolling, people can grapple you with the chain hook. How about giving this option to the one in the air as well?
Let me explain:
So Player A knocks player B in the air, as he is flying back, he does the the grapple move and pulls himself into Player A to perform a hit. Just like Player A would do to a player be if Player B was rolling.
If player A sees it coming and can react quick enough, Player A could perry and block the attack. That would be the end of it. Player A can begin the combo.
No you don't loose the mid air combos. It just speeds things up a bit. You have to get the second hit in before the player does the grapple.
Of course, this could just be a move in itself. Jump in the air and pull yourself toward someone whether on the ground or in the air. So instead of pulling guys to you, you throw yourself into them.