Why were two players linked together in this way?
"If Mueller is clean, then [RR] must also be clean"
It strikes me that this statement would have no meaning if Q wasn't planning ahead for a moment when it would appear that one of them was clean, while it still looked like the other was dirty.
Mueller has now done what he was needed to do. You can argue about "clean" vs "under control", etc.
Conclusion: RR's cover is deeper and won't become clear to the public just yet.
Q+++ linked these players for a reason.