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AlbaNY_Ram
It's a little worse than you thought: OL picked in round 4 turn into consistent starters 29% of the time, in round 6 it drops to 16%. The following chart covers 2005 thru 2014)

For this reason, I see them drafting up to 3 OL and at least 2 from the 3rd thru 6th round.

Maybe they get one solid starter from that and one good backup.

If you go by the the hit rate on OGs of 34.8% that zn posted below, you've got to like their chances of getting a couple solid contributors at minimum if they draft several OL.