Somebody can correct me if I'm wrong, but...
In a 4-3 the guys on the edge are considered DEs and mostly rush the passer but also can drop into coverage if that is the defensive call.
In a 3-4 the 2 guys on the edge are considered OLBs and can rush or cover. With the 3-4 the offense doesn't know ahead of time which OLB will be rushing, or if neither or both will.
So an edge rusher could be a DE or an OLB depending on the defensive alignment. Fowler, in our defense, would be an OLB.
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