What made Mang0 stop doing Fox dittos?

In mid-2015 he started doing it more and remained undefeated in sets until he randomly started using only Falco again. In that period, he:

-Was 7-0 against Armada's Fox in games:

-Beat Leffen in a Salty Suite and that weird C9 vs TSM exhibition (not very good data but basically the only sets they have)

-Destroyed Druggedfox, who's very good in the ditto and beat Silentwolf.

And then he just stopped. Did he say why?