A couple follow-up thoughts on things :
The innings thing with Roark makes little sense to me at this point. There is an argument for pulling him from the rotation to save wear and tear on an arm that hasn't pitched more than 160 innings ever. Or better said, there was an argument. He's at 192 innings this year. He'll make his next start tonight. So he'll be at 198 or so.
For those that want to save his arm, Roark will most definitely be #4 if he was in the rotation. At most a #4 will pitch 3 times in a postseason with lots of rest inbetween. Are you honestly saying "198 innings is fine, but 216? ARE YOU CRAZY THAT'LL BREAK HIS ARM!!!!" If the Nats wanted to rest Tanner they should have already started down that path. At this point the whole innings pitched point is moot to me. Other reasons to keep him out of the rotation might be reasonable but not this one.
One thing to remember about Soriano - we're judging him at his worst right now. Part of the decision making process is taking into account recent results, but part of it is not letting recent results cloud your judgment of how good a player really is. Less than 6 weeks ago Soriano was holding opponents to a .188 / .254 / .297 line and had a WHIP under 1.00. Are you going to dismiss months of work because of what you've seen recently? Honestly YOU CAN. Those 6 weeks matter more than the 6 weeks before that because they are closer to the "now", but don't dismiss the work Soriano had done before today out of hand. Consider it thoroughly then make your decision.
There are these "The Nats aren't letting up", and "the starters are awesome" themes that have been dominating the post-clinch coverage the past week. Those are nice stories. It's also true that those aren't objective looks at the team, but rather the positive feel-good vibes taking over at a positive feel-good time.
Oh, it's true that they've gone 12-3 and their starting pitching ERA is back to the crazy level of that mid-season stretch that had us all excited. It's also true that they are feasting on the fat part of their schedule, taking on no teams with good offenses (otherwise known as the NL East). The Phillies are below average. The Mets are below average with a healthy Daniel Murphy and he was recovering when playing the Nats. The Braves are awful and in a tailspin. The Marlins might be ok... but without Stanton I'd imagine they drop behind the Phillies and Mets. The pitching should dominate these teams and the Nats should win these games.
In fact they should win these games convincingly... and they haven't really. The pitching is doing their part and we should be happy about that. These are bad offenses but they aren't just holding them in check they are shutting them down. Still they've won 5 of 12 by one run, 2 more by two. All in all they've had one blowout win during this whole streak and they've averaged 3.8 runs per game. Blame the resting line-ups if you want but there it is. This doesn't mean the Nats are playing poorly (pythag expectation would have them at 10-5 or 11-4 during this stretch), but it does mean against lesser competition (MIA and PHI both have bad staffs, the Mets are ok) the Nats offense is scuffling along letting the starting pitching do the heavy lifting. If you think that'll work in the playoffs... well it might but I would rather see the team really play well in all aspects of the game going into the playoffs, rather than it's going now, with the Nats winning and us just assuming they aren't having any issues.