Schwartz never coached Dubnyk. Dubnyk was traded in Jan 2014, Schwartz was hired in Nov 2014,A quick reminder that after Dubnyk left Schwartz and the organization he finished 3rd for Vezina, 5th for Vezina and 4th for the frickin' Hart Trophy. Talbot meanwhile is pretty much tops in SPCT. Brossoit managed to become a career 0.917 backup in WPG.
Whether Schwartz is actively making our goalies worse, or is simply a poor judge of talent (and/or influence on the GM) is unknown, but his results have been pretty poor.
Dubnyk was coached by Fredric Chabot, who was scapegoated(by fans and Mact) back then for similar reasons(the failure of the goaltenders). Amusing sidenote - once Dubnyk settled in Minny, he had the Wild hire Chabot so he could go back to working with him again.