bWAR and fWAR both give the career edge to carter over piazza. however, i'd rather have d'arnaud mirror piazza's career for one important reason, with perhaps a caveat. piazza's first six years were astounding, and in those six years, excluding the 21 games he played in '92, accumulated 40 fWAR. in carter's first six years, he accumulated 28.3 fWAR. i suppose, though, that the fair comparable would be to look at carter from age 24-30, as that's what i did for piazza. in that case, carter has 37.9 fWAR, which is fairly close to piazza's age 24-30 seasons. carter accumulated 11.3 fWAR prior to his age-24 season. and if we subtract that from his total, then he ends up with less career fWAR from age 24-onwards. since d'arnaud would be entering hte year at his age 24 season (i think, right?) it makes sense to use the carter and piazza careers from that point onward. i suppose the caveat, though, would be that though their careers would end up being very similar in terms of overall WAR-value, a carter-like production would likely be more affordable, though perhaps less of a game-changer. and so the carter prototype would perhaps be easier to retain long term, and would allow for a stronger team to be built around him as he gets more expensive in both arbitration and free agency years. and if we can retain him for his career, maybe the carter archetype is better. but if we're only gonna have him for the early part of ther careers, maybe the first six years and a few years of extension, piazza is the way to go. and then somebody else can overpay him from age 33 onward.