the final secret of uchiha?

[nakshatra]

if the final secret is as said in 386 , then why dont the brothers jus xchange eyes that borth can get the eternal mangekyo?

[Sloanx]

if the final secret is as said in 386 , then why dont the brothers jus xchange eyes that borth can get the eternal mangekyo?

cuz that would helping Itachi out, and for some reason Sasuke is mad at his brother...can't remember, oh yea he SLAUGHTERED the ENTIRE clan...but for real, you can hardly call them brothers now, Sasuke wants nothing but Itachi's death, the "secret" is irrevalant in his eyes.

[Afro Thunda]

It seems the eternal MS is a fusion of both sharingans at this moment, so exchanging eyes wouldn't do anything.