Assuming you're saying the coaches the other QBs had were better than what Mac has had, but somehow those coaches had little to work with in terms of Darnold and Trubisky, the QBs Mac had were way better than these guys:
Sam Darnold...
1. ... had Jeremy Bates hasn't been in football at any level since 2018. He's 42 yrs old.
2. ... Dowell Loggains hasn't been in the NFL since 2020. Now tight ends coach at Arkansas.
3. ... Ben McAdoo... hrrr, um, well you know. Fired from Carolina after 1 yr.
Mitch Trubisky...
1. ... had Dowell Loggains. 1 yr. Went disastrously for Trubisky. Loggains was fired, hired by the Jets. Didn't go so well again.
2. ... Mark Helfrich who hasn't been in football AT ANY LEVEL since 2019. Now 50 yrs old.
I promise you, as bad as Patricia is or was, the trio of McDaniels, Patricia and O'Brien was a LOT better than Bates, Loggains, & Helfrich.