I do not know if this is an actual reference, or just a coincidence.... In ADWD, Jorah gets a helmet with ram horns. If ADWD wasn't some monts older than Skyrim, I'd say Jorah might be sort of Dovahkiin in the future.
I think it was just a bug. Maybe GRRM wrote a variant, where Unkiss actually happened, and did not use it. Sometimes it must be quite hard to keep track of everything what is in previous books and to not make an inconsistence like this..