As others mentioned the rainout let Stras pitch twice anyways which wouldn't have been the case even if Scherzer were healthy had the rainout not occurred. They would have got Scherzer game 1, Stras game 2, Gio game three and roark game 4 without the rainout. And even if we ignore that are you seriously going to argue they some how got worse pitching than they should have from their starters the first 3 games? Cubs beat Stras/Scherzer twice in the first three games anyways. That's not "luck." Hendricks out pitched Stras in game 1 and in game three they kept themselves in the game long enough to get to washington's bullpen.
So spare me this argument that the cubs were some how "lucky." They were the better team plain and simple. You know how I know this? The nationals did the same shit last year vs LA. They are a good team that doesn't know how to win in the playoffs. As I said initially, they had great pitching but where was this vaunted offense they were supposed to have? They had a 2 hit game 1, 6 hits game 2, 3 hits game 3, 5 hits game 4 and finally showed up game 5 with 14. 16 hits in the first 4 games of a series is how you lose a series. Cubs facing supposedly better pitching had 18. And washington had no ability to score without HRs. Zimmerman's double in game 3, and Russell's error game 4 were the only runs they didn't score via a HR in the first 4 games. Not to mention 3 runs out of their 8 thursday were via HRs.