and from the looks of it Sasquatch is fixed by the process and appears to be himself by the end!
I see what you are getting at here, but I disagree that it is because of the "process". Or, at least, nothing here says or proves it is part of the process. Also, all we hear is Sas give one line; not really enough to go on.

Does he appear to be himself? Sure. Based on that one line, and the two panels we see him in after the process of returning the Alphans to full life, yes, it appears he might be of normal intelligence. However, one could also look at him in his last panel in this book, notice the stupid and practically-drooling look on his face, and suggest that the opposite might be true, he might now be even stupider.

Only time will tell.