First, Gomes has a lifetime OPS vs. lefties of .886 (.976 this season) and he is a natural platoon fit in LF for the Nats with Lance Nix. Nix does not hit lefties at all, and with Morse at 1B, the only current righty platoon option in LF is Jerry Hairston. So, Gomes fills a need at a power position.
Second, Gomes projects as a Type B free agent under the most recent Elias projections, so it is possible that Nats could get a draft choice for him if they decide to arb him after the season--not likely but possible as he only earns $1.75 in 2011.