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This is true Sandy...but that's why you shouldn't build you player comps as either "yes he is one" or "no he is not"...you should create a statistical measure of similarity (one that is context adjusted unlike B_Ref's lame attempt)...and weight your total sample of guys who are at all similar by how similar each one is. I do this with the Chi Squared goodness of fit test.
Bottom line. Carlos Delgado will be on that list of guys who gets a weight...but he's not going to be leading the comp pool...specifically BECAUSE he's a different TYPE of hitter. Mark Teixeira's OBP is much more heavily forced by BA (the first thing to go with power hitters as they age) - Delgado is more of a stalker and his OBP is more walk-driven (lasts longer with old guys). Teixeira's PX can't compare to Delgado's. Tex's SLG is also forced by a higher BA...Delgado has more raw power. Not that Tex is a weakling...just that he's not naturally INCREDIBLY powerful...he generates his power with a good quick level swing...not with massive opposite-field explosive power. You need to be able to see that difference to understand why I think McGriff is a better comp for Tex...and why I think looking at Delgado is a mistake. Delgado's performances were driven by things that take longer to lose with age...his swing is quick, but it's also tremendously powerful and long. That doesn't disappear with age. Tex's power demands that he continue to be insanely quick and maintain perfect mechanics. As soon as he loses a couple milliseconds in reaction time and through-stroke speed drops even a smidge, and his power is going to drop.