You've already inadvertently nailed part of the solution. He needs to continue to pile up big league plate appearances. Less than 500 career plate appearances. Trying to evaluate a guy with anything less than a thousand is foolhardy. Move Lewis to 1B, put Lee at 3B and Keaschall at 2B and laminate the card. If Correa needs a day off move Lee over. Let Li'l Roger be the utility guy. Worry about what to do with Culpepper and or Houston when / if they get here. AND you're overlooking one important thing. With the possible exception of Correa, he's the only guy who wears a TC on his hat and plays in the dirt who is consistently able to catch a baseball and throw it to first base.