Completely different situations... In most cases, you're referring to guys who were all-pros at a position (Woodson, Lake, Faneca, Dermonti, Pouncey) and your backup sucked arse, so you're taking a shot in the dark to get by until your team is healthy.
Rod was an all-pro CB, who was no longer good enough to start at CB, so he moved to S, much like Charles Woodson is doing. Carnell was an all-pro S, who moved to CB cuz our depth sucked and Rod got hurt... at the first opportunity, he was moved back to S where he was better. And so on and so on...
I don't remember Kevin Greene playing anything but, "rush the passer" well... he was a one-trick pony, who had what 2 seasons as a Steeler.... and we remember him... why? cuz he did that one trick better than anybody else... THAT is the guy you wanna draft - the sledge-hammer... not the "heavy crowbar that can double as a sledgehammer in a pinch."
The best example you have on the list was Chad Brown - and he was really a backup, at all 4 LB spots... he was the swiss army knife i keep in the car... Seattle car-jacked us!
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