I think the situation between Kapler and Mench is a little different. Mench was platooning with Jenkins for much of the season, while Kapler only has 13 games left till Cameron returns, afterwhich his role would probably revert to pinch starter, PH and defensive sub. Though it's a small sample, Kapler has been having better ABs against righties than Gross so far. Currently, he has the hot hand against lefties and righties, and Brewers have won every game he started. I don't see any harm in letting him start the Cards series and see what happens. Gwynn is in the DL and most of the ABs in CF will go to Cameron when he returns anyway.