I thought Rosalee came independent of Monroe. They just hooked up after she decided to help Nick on her own. Nick called her for help with the girl who laid the golden egg and Monroe just happened to be there helping her with the shop.
As for Monroe, he may have took the initiative in befriending Nick, and they weren't exactly friends in the beginning as pointed out by Monroe, but that doesn't change what they became nor does it put a cloud over Monroe's loyalty. Nick still had to make the decision to do something atypical of a Grimm.
Besides, I thought the following Nick gained was quite adequate.
As for Monroe, he may have took the initiative in befriending Nick, and they weren't exactly friends in the beginning as pointed out by Monroe, but that doesn't change what they became nor does it put a cloud over Monroe's loyalty. Nick still had to make the decision to do something atypical of a Grimm.
Besides, I thought the following Nick gained was quite adequate.