"It's a 4-2-5 set, though what made it "big" was Mark Barron -- listed at 6-foot-2, 213 pounds -- playing a hybrid position that had him both helping out in coverage and rushing the passer."
that is not what the big nickle was, what Shurmur did with Rams and Cards.
When Rams are in a 4-3, THEN it could be a Big nickel, with Barron as a LBer
In Nickel it was not, as the writer says a 4-2-5 with one of the "2" being Barron.
Rams did that when Spags was here, a 4-2-5 with Dahl one of the "2"
Nice try by author, but he didn't get facts right
