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Maybe they won't, but I wouldn't put it in the drawer marked "will never happen".
If those LB's didn't start on the LOS, the OL can't cut them. Just like the lead back can't cut the backer on a run up the gut. Or a D-end lined up outside the FBZ can't be cut by the TE or tackle.
I don't have a book nearby, but the only otherwise illegal block that doesn't require the blockee to be on the LOS is the BITB by an OL.
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