Bill, I respect your obvious skills & expertise in speaker designs & always enjoy reading your fine contributions. At least you are a pro & more credible than most of us here.
Well for me this is somewhat similar in my vocation. I was a military pilot (fighters & SAR helos) for 36 years in our air force; however, I would never pretend to be able to predict how an aircraft is going to fly without getting in & actually driving it around for a while. Similarly, last week while my 1999 Pontiac (remember those?) Supercharged GTP V6 was in the body shop, the Mazda 3 4-Banger that they gave me as rental surprised the hell out of me with its wonderful driveability around town. Its Stop Light acceleration far exceeded my expectations & I wouldn't have surmised that it was such a small, economical motor. I don't know what its high end speed would be like, but it sure was uncommonly good in the city. My preconceived ideas were completely wrong.
So before we make anymore predictions on how the Brystons will perform or not, it would be appropriate IMHO that actual listening sessions & reviews be undertaken first. That is only fair....