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Blake Beavan, Charlie Furbush, and as long as he's in camp, Paxton and Hultzen, and Walker, and I'm sure there's stuff he could say to all the young bullpen pitchers and journeymen in camp.
And I wouldn't be all over having Hector Noesi's mentors be Felix Hernandez (barely older and immensely talented make for a hard time teaching lessons I suspect) and Miguel Olivo (Having a pitchers mentor be a catcher is a bit like having an Architect be mentored by an engineer I think, related in their tasks but still very unique positions).