McVay adjusts preseason strategy as Rams integrate rookies

Rams coach Sean McVay plans to play starters more in preseason to get rookies live reps.
Veterans like Stafford, Donald, Kupp unlikely to play preseason.
Rams have joint practices with Raiders, Broncos coming up.
McVay hopes Kupp returns for those joint sessions.
More preseason playing time allows rookies to adjust to live tackling.