So because the team has too much of something, it's okay to add to the logjam? I don't see the sense in that.
Also, consider this:
Over the last three years Sizemore has played 210 games (average 70 per year) with a .234/.314/.413 slash line, which Reddick surpassed last year, and he will make a fraction of what Sizemore is primed to get, so he is not an upgrade in any sense of the word. If a team wants to take the chance on him fine, but he doesn't fit with the Red Sox.