I've heard that, too. One of the rangers at Grayson Highlands was telling me that there is some evidence of limted glaciation on the peaks there between Grayson Higlands and Whitetop. So they were obviously alpine at one point.
An interesting fact about the Whitetop Mountain bald area is that it is thought to be a last remnant of alpine vegetation in the area, as unlike the Grayson Highlands/Wilburn Ridge area and Elk Garden, it has been bald throughout recorded history (The Native Americans called it "The Bald Mountain").
I've heard that, too. One of the rangers at Grayson Highlands was telling me that there is some evidence of limted glaciation on the peaks there between Grayson Higlands and Whitetop. So they were obviously alpine at one point.