Of course, not, but the next step after the grab is built on what happens during the grab. Both people (as I said) are in range and capable of doing something after the grab, so that's not really an issue (IMO) worth worrying about all that much. OTOH, who's stable and who isn't is going to make a big difference - IMO, but it seems like a no-brainer to me.
To a point... but you don't have to be that stable to hurt someone, especially if you're armed. I mean I can see it gives you an advantage, just not sure it's the only thing to be worrying about...
Also what if both are stable?