Catchers are far too high-risk/low-reward to merit such inflated rankings. As long as you can get one of the top-6 or so catchers out there, you'll be fine. I would reach on one if the only other alternatives were players the level of Estrada/Napoli, but there's more depth in the position than your rankings indicate. I definitely would not draft a catcher in the top 25. There's other disagreements I have, but that's moreso with Bill James. I see Towles is this year's Chris Iannetta, who he had as .900+ OPS last year. Yeah, but Martin is one of the few catchers that gives you a good amount of stolen bases though, making him more valuable than a lot of other players since he's at a typically offensively depleted position. So all others who might out perform from other positions won't rank higher because there's likely much more alternatives at those positions. While I think that ranking might be a bit high, I don't think it's too far off, especially if he repeats/improves on his numbers form last year