[Jiaz]

What are MD, RP, AD?
RD = RealDebrid?

You have to setup Hoster Rule to RG and there you can tell JDownloader what Accounts/Services to use for that Host.

Hoster Rules have no influence on linkcrawler! They just tell JDownloader how to download from a host.

JDownloader internally checks for mirrors of files and chooses best candidate (premium, multihoster...over captcha/free). If you want JDownloader NOT to add some host, then you have to setup Settings-Filter rules and tell JDownloader what NOT to add.

There is no need to remove mirrors yourself because JDownloader should choose the best one automatically