Board Thread:Theories and Speculation/@comment-1872728-20160404064008/@comment-734582-20160404082726

1: Presumably, yes. It's their transmigrant part that does the whole awakening thing.

2: doubtful. Else one could produce infinite Sharingan by endlessly transplanting regular eyes into an Uchiha who awoke Sharingan, and this would be so powerful, if it were possible it would've been done already.

3: Yes, it's likely that the rinnegan would be awoken. Vice Versa, Madara didn't have SPSM because he didn't have Senjutsu. So yea:

Indra: getting Ashura flesh gives Rinnegan. Attaining Sage Mode gives SPSM as well Ashura: Getting Indra flesh gives SPSM. Getting Indra's eyes gives Rinnegan.