Board Thread:Questions and Answers/@comment-75.249.138.37-20170128220055/@comment-10733658-20170129045643

And to chime in on the question, unless Ishida is completely tossing out the previous acceptance of normal Donation rules....

No, Amon couldn't become a Rize-based ghoul. Rize (AB) could not donate to Amon (A), because that particular combination would be incompatible.

Inserting Rize's kagune into Amon would risk killing him outright.