This may seem a minor point, but you may have noticed that Larry's photo is being presented as a mirror image. The bright peaks that are just coming into sunlight in his image (and in Mardi's taken about 3 hours later) are actually to the west of Gassendi, in the vicinity of Gassendi E and K. In addition, there is a kind of scarp running out onto the floor of Mare Humorum that also catches the light, accounting for the lengthening thin bright line.
But the elevations of the peaks to both the east and west, as given on the old LAC you mention, are about the same. I didn't try to check if they are accurate or not.