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That's an interesting theory, but by what Ienzo said the description really matches up with Roxas, Xion and Ven.
Roxas was outright named, the other heart was mentioned to have been with Sora almost just as long as Roxas had been, which would match up nicely with Xion and the last mentioned heart which was Ven, was with him for most of his life.
We also have yet to learn of a second heart aside from Naminé's in Kairi and I feel with Naminé's powers she'd have been aware of another heart withing Kairi.
However who knows Naminé might mention something in the next saga.