I think that above average front-sevens will expose the Rams interior oline this year. The Rams might be able to disguise their issues versus weaker defenses. However, teams like the Niners will likely make things difficult for that part of the line and therefore difficult for Stafford. That's is what concerns me above all else about the Rams. Not that the other things you mention don't matter, but the problems at RG and C are what have most concerned.
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"It's nice to be nice to the nice." Frank Burns