You may be right about Costanzo, but LF is by far Frazier's best position and the only one I've seen him play where I'd be comfortable with him every day.
This team needs another bat that can hit RHP. Costanzo is the best bet on the roster. If Heisey gets going he may help, but he's not going to get going with this Crazy platoon of 2 RH Hitters. Two weeks in AAA to get his stroke and then back to LF every day in the big leagues for an extended audition. Ludwick may be the odd man out.