It's not that simple. If we're going to claim that we are physician scientists, we have an obligation to address things scientifically. You wouldn't argue that diabetics don't need close blood glucose monitoring because "you can make a study say anything" so you shouldn't do it here either.
Take a look at this article if you get bored. Health Affairs is a serious, respected journal. They reviewed 500,000 cases and found no significant difference in patient outcomes. I have never seen a study with this many data points.
No Harm Found When Nurse Anesthetists
Work Without Supervision by Physicians
Health Affairs, Brian Dulisse and Jerry Cromwell,
2010(29):1469-1475.
Ultimately this is something that Gas needs to figure out for themselves. However, from my perspective, suggesting that CRNAs provide inferior care is completely the wrong approach to take. First of all, that notion is unsupported by any literature that I am aware of. Second, you can't really make that argument, then turn around and hire them. It's intellectually inconsistent.
There are a lot of great reasons to prefer anesthesia-supervised care over CRNA independent practice. Anesthesiology offers a range of services that CRNAs are not capable of, including ICU-level medical care, superior preoperative evaluation, improved ability to diagnose/manage/treat medical diseases, and significant dilution of the medicolegal liabilities inherrent in surgical care. If I were an anesthesiologist, these are the thing that I would be emphasizing to hospitals and surgeons. I don't think this is even a discussion that needs to be had with the general public, since ultimately it is hospitals and surgeons who will make the call on the desirability of independent CRNA practices.
FWIW - as an eventual attending surgeon, I find it highly unlikely I would ever utilize the services of an independent CRNA.