Thanks for the response.
It looks like MC-LAG and vCP are both implementations of the IEEE 802.1AX-2008 standard.
I can not fine anywhere that says they are compatible. In fact I find that each is a proprietary implementation of the said standard.
In this customers design, they have vCP between datacenters as well as vCP between core/aggregation/access 5K switches locally and at remote sites. If vCP and MC-LAG are proprietary, is there a way to make them interact?