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Even if you were to predict Victor lasting long (he would be an outlier for catchers), Napoli is 3 years younger.
In any case, I agree with you.. A Napoli/Moore jobshare would be fine, with Napoli getting some DH time vs LHs.
Heck, I'd extend Napoli for 3 years considering the price. We need good, cheap players right now. We can't worry about style.