When Ronnie Brown get hurt last season, I really didnt think it was something serious, he walked off the field on his own.
It appears that Ricky can carry the load, so I say let Ronnie take all the time he wants. Would it be so terrible if Ronnie was used sparingly in the first half of the season and then turned loose in the second (when his knee is in really good shape)? I kind of thought this was one of the advantages of having two starting caliber running backs.