I'm on a vacation so no real time to delve into issues but superficial judgments are what blogs are all about, right?
On head first sliding - I find it silly and unnecessary but I get the compulsion to do it. Even if it isn't faster (I have no idea) it feels faster going from leaning sprint into dive rather than leaning back into slide and you feel better moving your hands around tag then legs. I wouldn't do it (I'm not hurtling my face along dirt for 10 feet) but I get it. Should it be de-taught? I don't know. I think you can suggest stopping but until the injury does your work for you, you are fighting a player's nature.
On Matt Williams culpability - hasn't Bryce over hustled on like 2/3rds of all his plays? Unnecessary attempts at taking extra bases. Ill-advised throws home? This wasn't a slide "for Matt" it was Bryce being Bryce. Could have happened with Frank dozing, Manny de-spiring the team, or Davey spinning a yarn to Knorr about some bass he caught.
On loss to the Nats - uh oh. Now they are down a starting catcher, 3rd baseman, and OF, al with All-Starbtalent (hey catcher is a weak position). The Nats could still compete for that Wild Card (Fister should be here soon, Ramos could be) but it's going to be an uphill fight to get the offense going. I like Danny but best season ever? You're not buying that are you?
Sending him down was the right move. Now do they use Detwiler (that's what I would do) or call-up a spot starter? It's not going to matter terribly but if Ross is your Gorzelanny/Olendorf then treat him as such. They would spot start
On next stand - 2 games at Astros, 3 at Phillies. Pretty simple, they need to win more than they lose. True these are away games but against a terrible team and a division rival they see themselves better than even with injuries 2-3 means they either didn't win either series or got swept by the Phillies. Neither of those things are acceptable. Minimum win one series & don't get swept in other one. 4-1 is my actual goal as you go into every Astro series thinking sweep and the Nats should beat Phillies home or away.