Anything is possible, but I'm sure you get my point on the GA risks involved. Sheahan and aRchie unfortunately, and especially Archie can get too deep when they do sustain in other end. So its not a given having more possession would be great either. That might lead to more instances where they become susceptible to counter. I like both players but they've sure had their braincramps as well.
There's a few Oilers that aren't exactly stellar defensively...
Draisaitl (who I think you are quite familiar with
)... has a GA/60 rate of 3.27 GA/60 over the past 3 seasons... which is pretty much the worst number in the entire NHL at 5 on 5 among players with 1500+ minutes of 5 on 5 ice time over the past 3 years.
Obviously he drives offense which makes up for that and he's got a rate of 3.27 GF/60 which allows his team to at least tread water at evens... and then he feasts on the PP which makes him a strong net positive overall.
Point being... GA rates for individuals are still a team stat and they are subject to a lot of context based on strength of opposition/teammates/goalies, offensive/defensive zone usage, TOI usage etc.
I personally don't think you can just point at AA and say he blows defensively and will be a net negative no matter what situation he's in... it's up to the coaches to manage his time and usage to get the best out of him and play to his strengths/manage his weaknesses.
A good corollary is Benning... the team's record when he plays bottom pairing minutes is outstanding... not so much when he plays big minutes. When they play him in a bottom pairing role he is more often than not rock solid and it lifts the rest of the team as well as everyone else has their correct icetime/roles. When he has to play bigger minutes... the team is not nearly as good. That doesn't mean Benning is a bad player (not every player can be a top pairing dman)... it just means he has to be used in a situation that suits his skillset and given the proper ice time to excel and not drown when placed over his head.
AA hopefully will find his role on the team when Tippett can identify and assess his weaknesses/strengths as well.