I get what you're saying but the three Safety set failed in New Orleans because of our personnel, not because the scheme is flawed. Byrd was injured, Bush was injured, and KV regressed.
When you put a 220 lb player at nickel LB...you are risking injury. The Saints went to a 3-safety base because their LBs were horrible and they were trying to get their best players on the field. I don't think it was intentional.