It is very possible that Olivo will be today's catcher.
I really don't see the reason for him to catch today. It's a day game and after which the Marlins will board a plane for St. Louis. Treanor has been filling the role admirably and there is no need to test Olivo's "legs" by having catch nine before a plane ride. Another day of rest can't hurt.
That's my opinion and I can promise you this, the club never called me and asked for it, nor should they.