Not quite getting your point. EE had to know he was going to be asked to play 1b. He knew the team's roster. He agreed to play. Why is it ok that he went home when he was asked to grab a mitt instead of a glove? I don't know-- you just don't do that to a team.
If he'd simply said well in advance, "My Major League season is long. I only want to play this Winter if I can work on left field. Do you want me knowing that I'm only interested in playing outfield?" That would be fine. Showing up and insisting on playing outfield and wanting to try second base? That's just kind of crazy. Leaving when not hearing what he wanted? You decide.