I think TRF brings up some very valid points. This Alonso Votto discussion isn't made in a vacuum, other players come into the mix when looking at this situation. The likes of Frazier, Heisey, Francisco, etc. also play into this discussion. Is Votto at 1b, Frazier in LF, + prospect from Alonso > Votto in LF + Alonso at 1b? Its really a question you have to ask and consider. The answer isn't really clear and changing positions isn't exactly as easy as it sounds.