....Wait.
Does this Roy live in Texas? Because if so, then yea, I think. There was this Marth player named Roy that I played with and when he played against someone's MK, he'd do a Grab Release to Tipped Fair, so I'm like, "That works?" and I've been trying to use it on all the characters, though now I am assuming it only works on MK.
I really don't pay attention to big names, so if my Roy is Roy_R, then lol.
Other than that, I havnt picked up anything from him. Mostly everything I've learned is through practices, ideas, experimentation. I think the only 3 Marth ATs I've picked up from Combo Vids, Videos, Advice from Marth boards are Vertical Space, Dolphin out of Shield, and Grab Release Infinites, 4 including the Roy thing.