If that is Henderson's approach, EC1, the gaping flaw in his plan is that he would have no real clue whatsoever as to what his horses were capable of. If he doesn't run them beforehand, how can he tell how good they are - something which applies more to juveniles than any others? He can only ever learn so much on the gallops, and would basically be going into Cheltenham blind, if that was his approach. It doesn't make any sense......unless you are necking a bottle of VSOP for your breakfast each morning.
More generally, I dunno that trainers are particularly spooked by Mullins success in recent years - it sounds more like envy when they mention him, rather than fear.
For me, the principal difference between Mullins and the rest, is down to one thing - he has the best talent-spotters in the game. Ricci didn't even have to pay through the nose for horses of the quality of Vautour, Douvan, and Faugheen. Sure, they are expensive enough, but not extraordinarily so, because Mullins' team see things in them before their careers are even off the ground, and snap them up before they have achieved anything significant. In relative terms, Ricci has been paying bargain-basement prices for the best-possible quality horses.
DO, your brother has been reading too many Tom Clancy novels!