Ian Clarke's a top goaltender coach. He's also worked within an organization that's prioritized goaltending with a run of pedigree ones for two decades either trade or drafting first round or high second. He's also involved in amateur drafting which we've seen adds value seeing potential in a raw guy like Silovs. He has a 7 key skill sets for quality goaltending which he divides out equally in importance: athleticism, competitiveness, instinctive ability, reactivity, technique, and visual talent. Short memory.
Details here:
Conversely, the Oilers have had no strategy for goaltending. It's been a graveyard of recycling older veteran guys and volume flipping mid/late round draft picks hoping to find a prospect who might turn into an NHL goaltender. Highly expensive and in-efficient approach that didn't work until their big money guy Campbell failed and the rookie mid-level prospect Skinner stepped up.
What you describe are bad habits within Skinner's game. It's not necessarily tied to coaching. Looking through the Ian Clarke lens its 17% of the big picture where I'd rate Skinner from my limited context as lacking athleticism, maybe average instinctive ability, reactivity, and visual talent. But high competitiveness and solid resiliency to absorb starter goaltender responsibilities as a rookie on a winning window team in his hometown. He has critical developmental areas but this team would have been hooped had Skinner not stepped up at least in regular season play.
Regarding Schwartz there is evidence he has nurtured prospect development phase goaltenders into regular NHL goaltenders with Skinner, Hart, Boissoit. At the same time Talbot has only been a short-term journeyman across multiple organizations since leaving Edmonton.
I think for some there is a distorted or incomplete impression and expectations of the role and work of a goaltender coach. Here's another good Ian Clarke podcast that discusses the coaching role. About the 30 minute mark is some good detail about the work with Bob including being a 'North Star" to keep the player focused on core foundation for success:
I'd consider firing Schwartz over whatever his role was in identifying Campbell as this team's big money bet during its finite winning window. But his protege has saved this organization's bacon having to step up in this mess. I also think the Oilers were firmly targeting Cossa in the draft before Detroit snaked it moving up to get him.