Actually Billy has been doing pretty good, there's a good chance he will make it onto our PR list when we update it in a bit.
As for Wario vs Yoshi, Bwett hates that matchup lol. On good days, I will ground break consistently up until right about 50%, and after that it's near impossible for anybody to humanly break it then. If I outright ban FD for the set, he has a hard time finding a reliable stage to infinite me on, not including the issues he already has with people being able to ground break it a lot. On my CP's, I can run away from Yoshi too easy (Rainbow Cruise, Castle Siege, and Brinstar come to mind).
I haven't played him SUPER recently, but last I talked to him he believed the matchup to be even at best for Yoshi and at worst 60:40 Wario's favor or 65:35 on one of his ridiculous CP's where he runs away the whole time.