If you find it on Bitbucket but it’s not in the store, that usually means it’s not ready for release yet. Perhaps we are still testing it out. Perhaps we are waiting on some updates from the developer before we make it publicly. Perhaps we are workout documentation. The only real conclusion you can make is that it’s being worked on.
As of now, once a plugin is in the store, customer created plugins don’t get put into the Enterprise plugin.tar.gz file. For Enterprise subscribers to use customer created plugins they need to access Bitbucket. To SDK subscribers, seeing on Bitbucket doesn’t help you.
Rob