Theriot had a 71 OPS+ in 2007, and it's 65 right now. He's essentially the same player that took over the starting duties that year (as his numbers were propped up from platooning earlier), and he's turning 31 this offseason. He's not all that great a bet to be any better. He probably shouldn't even be used. Straight up OPS comparisons to past years aren't as telling as you are hoping, because for one, offense is down across the board. The NL OPS is 729, compared to past three years of 739, 744 and 756. These guys are also pretty old. Having worse numbers in your mid-30's than you did in your early 30's should not be a surprise. Combine the expected regression of aging with the significant decline in offense as a whole, and Ramirez is still the only one with a surprising low performance. And he's still the guy who had a real bad shoulder injury last year, was hurt this spring and dealt with an injury all season so far.