The Jason Marquis and Matt Capps signings have sparked a new wave of "the Nationals should be rebuilding, not signing veterans!" stories like this one.I'm a long-time advocate for the Nationals focusing more on the long-term rebuilding project, but I think the Marquis and Capps signings are solid moves. More to the point, I don't think these moves do anything to undercut the rebuilding effort.Here the key things to avoid when rebuilding:Signing over-30 players to long-term deals, so that you have a couple good years for bad teams but are locked into a contract with an over-the-hill player when the team is getting good. (Example: if the Nationals had signed Alfonso Soriano after 2006.)Signing type-A free agents who cost draft picks (Examples: Vinny Castilla, Cristian Guzman in 2005)...

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