Unova was confirmed to be New York, and as speculated for very good reasons the new region is based in Europe. Unless by plane or boat, I don't see the two being connected at all. Johto and Kanto were connected because the regions they were based on were also connected.
Plus the theory seems way to looked into, seeing as they were just used as statues and nothing more.
Also, I doubt GF would put emphasis and give a main plot point to a previous Pokemon and center its theme around one.