I can't speak for everyone, but as I am one of the less-enthused rankers of Foster, I'll respond.
1. I updated all my rankings and projections as of August 23rd, at every position and the overall.
2. I didn't just "refresh" them, I ground through each fantasy worthy player at each position for each team and reworked the numbers to reflect injury situations, camp battles and etc.
3. Referring to Houston specifically, here's where I see Foster and Slaton as of the 23rd:
Foster 200-225/800-900 yards/6-7 TDs rushing with 37-40/300-350/0-1 TDs receiving (he's in a PPR tier from Cedric Benson to Darren Sproles (all within 10 FP of each other from 30-37 on my board))
Slaton 100-125/400-500 yards/3-4 TDs with 20-25/180-250/0-1 TDs receiving (out of my top 50, in a tier with Jerious Norwood, Toby Gerhart and Brian Westbrook from 55-58)
Last year as a team, the Texans put up 425/1,475/13 rushing.
4 backs had 50+ carries last year, and Schaub had 48, the wide receivers had 9 attempts between the top 3.
Assuming that between them Jermiah Johnson, Chris Henry and Vonta Leach handle between 70-100 carries for 250-400 yards in bit roles, we get roughly between 430 and 510 carries from my set of team projections - a slight-to- increase over last year's 425 (which was 20th in the NFL). The above spread would be somewhere in the upper half of the league, based on last year's spread of the top 16 teams (438-607 rushes).
I think that my projections for Houston are well within reason, as is my projection/ranking of Foster in this probable RBBC.
.