I'm not sure how much of it is "mentoring", i.e. the teaching of young guys how the majors work, as opposed to filling a need and having a calming presence in the locker room. I think a plan of platooning Vargas with (for example) Alvarez isn't horrible. Vargas can't hit righties but might kill lefties and Alvarez can still crush RH pitching (.848 OPS against RH pitching last year, although he played in Camden). The Twins are pretty set at most positions but not really at DH. Park is AAA bound, Palka needs at least more time there. The two main DH options right now are Vargas and Grossman. For some reason, many of us seem to think Grossman should be DFA'd but want Vargas to be the fulltime DH, despite Grossman being the better player. So I don't think we should overly worry if the FO gets someone like Alvarez to make DH stronger.