I'd say so. Though in the case of Columbia, when the quad mix was done by the artist's preferred engineer (that may have worked on the original stereo release) instead of one of the in-house CBS quad engineers (like Larry Keyes or Don Young), it suggests to me that the artist may have pushed for their involvement.
Examples of this include:
Chicago's quads- almost all done by Wayne Tarnowski
Aerosmith's quads- all done by Jay Messina
Barbra Streisand's quads- several done by Sy Mitchell
This is all just speculation on my part though.
even outside of CBS, i think this happened a lot more than is acknowledged, with either artists' preferred engineer or engineer doing the album in Stereo also doing the Quad.
you had Geoff Emerick doing the McCartney Quads,
Phil Schier doing the Quincy Jones' Quads,
Bill Schnee did the Garfunkel Breakaway Stereo & Quad,
Bill Szymczyk did The Eagles Quads,
Glen Kolotkin did Azteca and several Santana Quads,
Lou Bradley and the Charlie Rich Quads,
Thom Bell doing The Spinners,
Robin Black did all the Jethro Tull's,
Rubinson & Catero did the Herbie Hancock's,
Margouleff & Cecil did the Isley Brothers,
Roy Halee did the Quad on albums he worked on for Simon & Garfunkel (BOTW, Angel Clare, Paul Simon debut),
Phil Ramone did the other Paul Simon Quads,
i could go on but i have to go!