couple of quick thoughts occurred..
why fake it in the first place?
did Hancock have to release it in Quad to fulfill some contractual obligation?
.. but then how could that be because they skipped Man-Child in Quad in '75, why bother faking Secrets in Quad in '76 at all if they didn't have to release it in Quad?
not sure i'm totally sold on the studio time expense angle? i have a recollection reading Catero had his own studio in San Francisco kitted out for Quad? if that was the case would there really have been greatly added expense?
there's also consideration of Catero's reputation to uphold, why would an engineer of such repute put his rep on the line and fake it and put his name to it as he did on the Secrets SQ LP which credits him as Quad Remix Engineer? half-assed fakery something to be proud of when he'd done so much great work? i think not!
also, maybe i'm being naive but i doubt CBS would've been very happy at such fakery, even though the writing was on the wall and other labels had given up the ghost, Columbia were still doing real Quad mixes throughout the following year in '77 (quite a few as we know!) and yet CBS didn't throw in the towel til the fat lady sang her Musicmagic! hmm...
something smells fishy!
Do I need to put my gas mask on; I know, I'll just spin some Quad funk ta get the stank out!