This is a giant leap of faith. The idea that "any" of the players you listed are "likely" to be better than Kepler, in
the long run, is a pretty bold statement. Lewis perhaps, but is he an outfielder? Martin? Come on, at this point, it's impossible to predict if he will even be a big leaguer. Rodriquez, perhaps, but definitely not next season. We have to remember that the object is to put the best team on the field, within the financial constraints that the organization sets. Kepler has a reasonable option. He is most likely not blocking Wallner next year. The object is to put the best team on the field and win games, not find out whether or not guys can play.