I think it's nonsense. The hollow that attacked Kaien was one of Aizen's failed experiments and not an arrancar, nor is it likely that Aizen would trun it into an arrancar because it was not a Menos or higher and would thus be weak. Certainly it wouldn't be strong enough to be an Espada. I think it's more likely that it can read minds and shape-shift than that it's a fuse of Kaien en the Failed Experiment.