It's best practice to have all the servers in a replicated group on the same version. With that being said I would install the 2008 server into the group with the 4.6 install, allow replication to happen, remove the older servers, and then upgrade the 2008 4.6 install to 5.2. I also assume you will upgrade composer as part of the view upgrade so that you can test provisioning and then move the databases to the new 2008 vCenter?
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