User blog comment:Gourgeist/Shingeki no Kyojin Chapter 65 Review: Dreams and Curses/@comment-7418318-20150112232657

So... if she only eats a bit of his bonemark from his spine, would that end up with both of them having that power?

Eren has already proofen that he's doing all he can to save mankind and wipe the Titans out, so isn't having two such "Master Titans" the best they could get?

Just have Historia train to retain control of herself after shifting (Eren would be very helpful in this regard, since he went through the same process), then have him donate the marrow and everyone wins.... at least Historia should think of that.

Lod clearly wants to keep that power in the family, which makes Eren a problem, but Histora really should think of that.