I think this is a cool nod to baseball history and the small group of Nats fans that are Expos holdovers, but if I was an Expos fan I'd be bothered by this. It is one game. It doesn't really matter. I'm fine if Montreal gets a team if the Nats "give" them their history. The Twins and Rangers should have "given" the Senators history to the Nats. History should stay with a city and the fans who lived it.
The Nationals leaderboard should have players like Walter Johnson and Frank Howard, not Dennis Martinez and Vlad Guerrero. Failing that, it should be Zimmerman, Strasburg, and Scherzer at top of the career leaderboard.
And that is no insult to the Expos, who have a fun history, great players, and top notch uniforms.