The 53 and what it was/is
Part of the problem here is by the 1970s, there were strong and weak 4 man fronts. In these fronts, there is a gap between the DT and one DE; sort of like this:
Now we know that Manny Fernandez was a nose tackle in the 53, and that Bob Matheson was playing in the normal position of a defensive end. There is no way, just looking at the reports we have now, of knowing whether the 53 lined up like this:
or like this:
or like this:
I suspect, however, that the 53 was more like my 2nd diagram than the standard 3-4s of today. And given that kind of fake "over" lineup that it did cause a lot of confusion in the pro ranks.
David.