I have two separate hypotheses to disclose. Please judge them on their own merits.

First, I believe this prophecy relates to Rand using Callandor with his two channeling girlfriends. Rand, Elayne, and Aviendha being linked through the Warder bond may not be enough to consider them one, but I think it will be a key factor in helping this along. In other words, through the combination of the link through Callandor, the Warder bond, and the love they share for each other, they will have a unique opportunity with regards to controlling the One Power due to their unity in spirit.

Second, I believe that Callandor itself is not flawed as Cadsuane reveals. I'm not saying she's wrong. She states that Callandor was created without the buffer that angreal/sa'angreal are usually built with. I believe this was the reason that the taint fluxes when Rand tries to use it. The only safe way to use it, she claims, is in a circle. However, I posit that the lack of buffer will allow Ralayndha to reach a higher channeling potential than perhaps even the Choedan Kal allowed. The circle would be using the natural attracting/repelling nature of Saidin and Saidar to keep the One Power in check and prevent burning out while Callandor acts as a pure magnifier.

Thoughts?