Barnz, in your initial post, you used the word movement twice. So if you think there is a movement issue, you should be able to observe, measure and record changes. If none are found, keep attention and check over time. Show reserve and don't make snap decisions. My private reaction to your first post when I read "expansive movement" was "Aha, water" i thought that the panels might be swelling and binding. When using very large panels there should be a proportionally larger expansion joints. So I would look for swelling of roof and wall surfaces. Don't alarm your clients, look for evidence and discuss observations or the lack of evidence. Take comfort in not seeing things going wrong.