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Kotchman saw 1900 pitches during 2009 -- and we're going to focus on what he did against 60?!?
What was Branyan's mark in 2008 against lefties?  He hit .000/.000/.000 -- 0-for-14 with 8 whiffs.  THAT RESULT was referenced as why it was obvious that Branyan should never, ever, under any circumstance, be allowed to hit against any LHP for the rest of his natural life.
Branyan would go on to post an .802 OPS against lefties in 185 PAs.
How much is 60 pitches?  At 4 per PA - that's 15 PAs.
Branyan had barely 300 PAs against lefties for his entire 12 year career prior to Seattle. 
For his CAREER - he's 50 points light in OPS against lefties -- but we're going to ignore the career - and concentrate on 60 pitches during his worst season? 
But fine -- let's look at data to support the PRE-CONCEPTION that he's a platoon bat.  What do his BABIP splits look like:
2007 - .270-RHP; .295-LHP
2008 - .262-RHP; .297-LHP
2009 - .280-RHP; .290-LHP
2010 - .242-RHP; .143-LHP
Career: .270-RHP; .295-LHP
For his career, his avg and obp are essentially identical vs. lefties and righties.  The ENTIRE difference in lefty-righty split is ISOLATED POWER.  He slugs 50 points lighter against lefties, (while having a significantly higher BABIP -- which completely baffles me - but okay, that's what he does).
Okay - his K/BB suffers a smidge against lefties.  But his BABIP is 25 points HIGHER against lefties for his 430 PA career. 
Considering his career OPS against lefties is a bit over .700 -- and the current roster has only three players (Gutz, Ichiro and Kotch) that are currently producing better than .667, I'd say any thoughts of platooning are severely misplaced.