Your agument doesn't mesh with the results, and the results say Alonso doesn't hit LH pitching, hasn't produced any real power after leaving the league that suppresses said power, remember, like you said with Stubbs? We were supposed to see this spike in his power once he left the FSL. Never happened.
Right now I see Alonso as having a Pete Incagvilia feel to him. Lots of hype, not so much in the results.