The change in the ADN management protocol in 188.8.131.52 means that the upgrade order for peer and manager ProxySGs is crucial to maintain an optimized network during the upgrade. The order for upgrading peer and manager ProxySGs is to upgrade the managers first and then the peers (edges and concentrators/cores). The manager ProxySGs are backwards compatible with all versions of the ADN manager protocol so having them run 184.108.40.206 first ensures that they will still be able to communicate with peers running 6.2.3.x or older. If the peers are upgraded first the managers are unaware of the changes in 220.127.116.11 and communication between the peers and managers will be broken.
Regardless of the versions of SGOS, Blue Coat always recommends upgrading the managers first and then the peers in a closed ADN network.