I don't think zoom is a future jay or zolomon, if zoom could travel time (should be easy for him with his kind of speed) then he'd better go back in time and replay the end of last episode and eventually win.
I hope time traveling stays a bit unique for Barry and reverse flash and the future.
And i believe that the real Jay is still alive (the masked man) zoom just killed zolomon that tried to copy real Jay's speed.
But then again 2 Jay's on 1 earth... then we're back in timetraveling
stupid time travel.. i'm getting a headache -.-