Mmac based absolutely everything off of theorycraft. He hardly even did wifi to find out matchup ratios for himself. Because of this, his view on matchups were highly contorted and because of his pride he would not admit this. He was also so determined to make yoshi look good that he continually tried to say the mk matchup was in yoshi's advantage, as if yoshi had the capabilities to do so. Mmac tried to push everything as an even matchup to try and make yoshi middle tier. If we wanna make yoshi middle tier, we have to prove it through tourny results, not matchup discussions.
EDIT:
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lol lilb my jiggs could 2 stock him easily, he rarely played so his yoshi never progressed. instead of simply saying "i need to improve", he threw a hissy fit (in particular to yoshi going down the tier list) and after a few more times of him showing up, being embarrassed about yoshi's tier placement, he disappeared. this is why i believe he left SWF: yoshi's tier placement. Other theories include him moving to the US and simply not having the time for smash.