I hate to be the guy that says "hybrid" everytime someone posts vieja juvies, but I have some doubts about this fish. I'm looking at the spots on its side & thinking it looks alot like the juvie you posted that most people thought BB or BBxsyn. I see alot more syn characteristics in this fish, but those spots on the flank give me doubts.
Are all these "syns" in the same tank at your LFS? Have you asked the LFS where it got its stock from? Its possible that they bought a batch of BBxsyn fry from a local hobbyist...just thinking about possibilities here.
Anyways, I think a BBxsyn would make a pretty badass hybrid. Grow it out and see what you get.