Well, he went on another ride this morning, before going to the PT. He probably didn't get my email with Knott's advice until after the visit. He's out of town until the end of the week, and I am going away Friday, for the weekend, so I won't get updated until then. His wife, my friend, came by for a swim after work. From our discussion, I am pretty sure he will give the PT the boot. He can work with a trainer at the gym to do some of the stuff he's doing.
He's very rule bound, so even though my DH told him he needed to push the limits on this and do what he needs to (based on his own experience after getting stents), because sometimes we know our own bodies better than anyone, he sort of just did what he was told. I think that is over and getting on the bike did the trick to make him see this. We already have a ride planned for the 18th; 40 hilly miles up to NH.