Board Thread:Theories and Speculation/@comment-28323245-20170530200422/@comment-25122992-20170530201125

Quite unlikely, I guess, since Obito's regular Sharingan stayed in its 2-tomoe form until Rin's death, where the MS awakening also triggered its developement to the 3-tomoe mature form. Had Obito awakened MS during his "death" incident, then his Sharingan would've already consisted of 3 tomoe, even if the MS itself wouldn't have been active.