Maybe I'm just not seeing it, but I cannot confirm based on the feedback that this AP is actually adopted.
In the running config posted, the AP's hostname is "ap7522-74D840", but in the earlier output of the APs that are adopted to the RFS4K, I don't see this name listed.
Please run the CLI command on the RFS4K:
#show adoption info
On the AP's CLI, run the command:
#show adoption status