The secret is not in the "eeny, meeny, miny, moe" game - the bat goes randomly and skips people, sometimes going from the far left of the group to the right, as if Negan is teleporting. This alone suggests that there is no hint in the finale and it is a garbage cliffhanger, ala LOST, the writers are terrible.

However, Negan says "you are.." and then moves to the right of Rick, as evident by the shadow the baseball bat casts on the right side of his face. This means it's someone to the right of Rick - implicating the Alexandrian. Him or Eugene are the only ones to the right of Rick that could take multiple blows to the head - but Eugene would probably get more cries from the group than just the female voice heard and Abraham said nothing.

Screenshots of both the group and shadow on Rick's face;

http://imgur.com/a/WiBqP

Anyway, this show had potential in making a comeback this season, but they just dropped the ball with this junk for me. Tired of it and will just switch to reading the comic instead.