Football still requires 7 players on the line of scrimmage, and the 4 remaining are 'backs'. The flanker was just a pass catcher that was just behind the line of scrimmage. The two players on the ends of the line of scrimmage just happen to be eligible to catch passes, one was usually 'tight' and one 'wide'.
I don't know when the term 'flankerback' faded, but I recall Johnny Rogers was drafted as a Flanker. I'm guessing the terminology ended around the early 70's, probably around Air Coryell. I think in the old days the Flanker was the faster receiver, who they wanted to keep off the line of scrimmage to avoid him getting jammed, and was on the opposite side of the Wide (or Split End). Now, wide receivers are asked to play on the line (X), opposite but off the line (Z) or between the Tight End and the Z, (Y, or Slot).
I don't know when the term 'flankerback' faded, but I recall Johnny Rogers was drafted as a Flanker. I'm guessing the terminology ended around the early 70's, probably around Air Coryell. I think in the old days the Flanker was the faster receiver, who they wanted to keep off the line of scrimmage to avoid him getting jammed, and was on the opposite side of the Wide (or Split End). Now, wide receivers are asked to play on the line (X), opposite but off the line (Z) or between the Tight End and the Z, (Y, or Slot).
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