Alonso OPS'd .880 in Sarasota. Frazier was at .808. Thats a bit of a difference. Frazier was not even better at AA, where Alonso OPS'd .829 while Frazier was at .831. Frazier was also older and not dealing with a wrist injury. Of course SSS applies as well in Alonso's case.
But to get to the first part of your post, why do you not make that move if the combo of Votto to LF and Alonso at 1B is better than keeping Votto at 1B and someone else in LF? The fact that Votto may be better than Alonso at 1B means nothing if the move makes the Reds better.
Again, not saying it does. But completely ignoring the fact that it could happen seems to be going on an awful lot in the thread.