I just thought of something kind of odd. I'm not familiar with Gunslinger, so I might have the numbers wrong, so please correct me if I'm spouting nonsense.
Standoff 3 has 6% chip. Standoff 2 hits for 5%. If the opponent blocks F13 or any other string, and have been conditioned to expect a cancel into Standoff, there's no drawback to jumping forward, right? Assuming they can't punish the gap with a grounded normal If they get hit by Standoff 2 they take 5%, which isn't bad, but we get no followup and if they block Standoff 3 they take 6% chip. Sure, we get to setup Sand Grenades if Standoff 2 hits, but the risk reward is "5% + Sand Grenade chip" versus "full jump-in combo". So, on paper, there's no reason to remain grounded against a cancelled string into Standoff then?