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This is a classic case of how having more information makes us understand a player less. Platoon splits of right-handed hitters are almost always misleading and should be ignored. Even with 2000 PA's against southpaws (which would take over 10 full seasons), you would have to regress a righties observed platoon split by 50%.
Gutierrez has only 700 PA's against lefties so his splits aren't anything to make hay over. If he can hit lefties he can hit righties; they aren't two completely separate skills. If he hits like he is capable of then he will be a very good full-time player.