After watching the tick throw video a few times, there are many times where a player can just jump out of the way before he grabs them out of reaction from seeing the starting animation of the grab...Plus even if they do alternate guard and you decide to hit them low, there is a big chance they can block that low attack too. Someone can just decide to alt-guard right when they see his grab animation, and you'll get punished. It will be too late for you to throw out a low B or sweep.
So, I feel that tick setup has too many options against it.