Fred was a big believer that you needed an auxiliary blade in order to produce more of a "hole" versus a "slit". He pointed out that 2 blades occasionally entered parallel to muscle strata which can cause the exterior wound channel to "seal off", reducing blood on the ground. Shifting of outer layers (hide, fat, tallow, etc.)can also cover, or mis-align with, this slit - especially on angled shots. So, in retrospect, you could say that the theory behind his four blade broadhead (main edges plus "bleeders") is similar to the advantages you read in 3 blade head promotion. Of course - as we all know, shot placement of a sharp, sturdy broadhead trumps other considerations.