My only concern with bringing Harper up to start the season is where do you bat him? They probably want to bat him low in the order which means we still need LaRoche to break up the RH 3-4-5 of Zimm/Morse/Werth.
Would Davey be comfortable with Zimm-3, Morse-4, Harper-5, Werth-6?
If they don't sign a lead-off / CF type, then you could play Morse and Harper in the OF at the same time and still have LaRoche at 1B, but then we still don't have a lead-off hitter (unless Reyes replaces Desmond).
I still think it makes more sense to bring Harper up in June, or in July, especially assuming they trade LaRoche before the deadline after he establishes some trade value. But I've been thinking lately, what would Nats do after spring training if:
1) they trade for/sign an everyday CF
2) they keep LaRoche at least for the first half of the season, AND
3) Harper rakes it like Mickey Mantle in spring training, and Davey/Rizzo decide he needs to go north.
How would the playing time be divided between Morse, Harper, new CF, Werth, and LaRoche? Would they each play roughly 80% of the time - with everyone except the CF and Laroche playing multiple positions?