Originally everyone would have thought that Adam Everett would be the odd man out but he has started 9 games this month and hit .348 for August. I don't see anyone from the bullpen going down with the recent struggles so it seems to indicate that it would either be Ruiz or Harris.
Ruiz has only played a limited role since he has come up but has hit well with only a few opportunities. Harris seems to be in Gardy's dog-house and only sees spot starts at 3B when I left-hander is on the mound. I'm not sure if Harris still has any minor league options but I am guessing it will be Ruiz that goes.