This has been kicked around for a couple of years since we started drafting guys who look like 4-3 D-Linemen. For instance:
http://www.packernet.com/blog/2012/...er/?utm_source=twitterfeed&utm_medium=twitter
We'd need further clarification regarding this specific implementation, but it sounds like it would be very similar to our nickel front but with Perry having his hand in the dirt, backed by 3 LBs (besides Perry and Matthews)...alternatively you could think of it as a 4-3 set with Matthews as a stand-up DE, if you will. Whether they intend to use this in a nickel set instead of or in addition to the "4-3 Under", as some call it, remains to be seen...but at this point it starts to become semantics as noted in the above link. Whether there's a third LB or a DB coming up in or near the box (as Woodson often played) is six of one, half dozen of another.
There's seems to be a key difference between what's described in the link above and what Demovsky suggests. The description in the link (and the Haley example among others) has the elephant on the weak side...the guys who have played this position are usually the best edge rusher, moving around for a one-on-one match up. Demovsky suggests Perry-as-elephant will play strong side (between the OT and TE) rather than weak side, though I'm wondering if he was just illustrating the 7 technique.
If it maximizes Perry's pass rush ability I'm all for it...this should be his natural position. As for the "3" in this 4-3- style D, it will be interesting to see who they use...Hawk, Jones, ?.
I see this as a wrinkle, not a substitute for the standard 3-4 base D...the kind of think they'd use to exploit (or defend) specific match ups...maybe a bunch some games and little or none in others. Given the personnel we've got, you'd think this alignment will be put on a long leash...that is, given every opportunity to succeed even if at first it doesn't look very good.