If you think Bouchard is terrible defensively, wait til you watch Chabot on a nightly basis. He's the guy that Bouchard posterized. Bouchard is also a playoff monster.
I'd rather have Bouchard at 9-10 (which is where he'll come in) than Chabot at 8, seven days a week, 365 days a year.
Left handed, older, under team control for fewer years, poor defense, not as healthy as Bouchard is, not as good offensively, still very expensive, wrong handedness for what we need. I can't think of a single reason for Edmonton to do this.