The HL is needed downfield in pass coverage until the QB commits to the run. A single BJ cannot cover both the middle of the field and the post. Doesn't mean that the HL needs to be behind the receivers -- that's what the BJ is for.
If the R hadn't got caught out of position, he would be in the perfect place to follow behind the QB on a run to the HL side. He could've followed and watched for late hits AND for a spot if the QB went out of bounds. Also, once the QB committed to the run, the HL would work his way back upfield and be able to cover very quickly.
In other words, there's good backup coverage (the R) if the QB runs. If he throws a post to the HL's corner and the HL commits to the run, nothing is covered.
I think most coverage breakdowns happen when the wings don't go downfield. Of course, once downfield, a wing needs to recognize when to come back upfield.
Rich
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