I agree with your innings limit and I do expect him to be pulled as I expect Cavalli to make his appearance in the later part of August and not before. Hopefully Williams will be back then and can replace Parker as he will be puled also. Maybe the rotation will be Gore, Gray, Williams , Cavalli and Corbin (POS).
Only way Williams pitches for this team after July is either if he's not healthy enough before the trade deadline for a contender to want him or if the Nats find themselves in a 4 or fewer team race for a wild card and there's a change of heart about going for it.
Irvin will pitch as long as the games are meaningful. He's made 14 starts through 67 games. figure his slot will come up another 18 and game 162 if it matters. He's thrown 81 IP over the 14 starts, or around 5.8 IP per start. IF he goes another 100 IP, he should be able to cover 17 starts at that rate. Basically, skips his last 2 starts, maybe just one.
Parker faces the more stringent innings limit. He went 124 IP last year, so figure he's maybe 160 max? Again, about 100 more IP. he's at about 5.5 IP per start, so that could take him out to the end of the year. Gore will also be able to pitch into September too.
I don't see Corbin starting in September, especially if Gray and Cavalli are effective when they are back. By that time, there may be some of the AA arms like Lara or Lord who get a look.
