Nevermind, tried it out today, way to slow, although I was experimenting with forward tilt desynch, its frighteningly fast and easy, I was able to consistently block and blizzard out of it with very little lag opened up a lot of room for grabs and I won a lot more games than usual, he had to approach or I could start desych trixies, he destroys me on Yoshis still cause he is so mobile on the platforms but on FD and Dreamland I was able to even it up and even win the majority of the games on those stages, PS was kind of iffy, we didn't get a lot of games there (we random neutrals) and the platforms were a mixed blessing and curse.
Dash dance blizzard, and forward tilt blizzard or block were both pretty easy to do when he was keeping away from me, if I was careful I could dash attack him, he crouch canceled most of them but I was able to tech chase grabs a lot of times, I still can't get consistent edge chaingrabs but I imagine they would help A LOT!
I started utilizing my rolls a lot better today against Marth as well, at the very least it switched up the playstyle he was used to and it got me out of some pressure situations I used to get trapped in, a few of the times I managed to get behind him and jab into some throws.