There are cases, particular on the expansion teams, though it does come up on the 2016 Atlanta Braves All-Time All-Stars at the Catcher position, that there could be a TIE for the last spot.

OPS+ will be used at the Tie-Breaker.  If the players have the same OPS+, then the tie will be broken by my own judgement.  (And for fun, I might list the ties here for further discussion.)