Board Thread:General Grimm Discussion/@comment-5141248-20160517062339/@comment-71.166.62.83-20160517102705

Trubel said in the last episode it makes sense they would want Grimms on their side because they want to keep their heads. In other words, better to make them friends rather than enemies who would kill them.

Renard also mentioned Nick is the very first Grimm ever to befriend/fight alongside Wesen. That would explain why they would approach Nick (though they should have considered the possibility nil once they forced Adalind to leave him with Kelly).

As for Kelly, there is also a possiblity he may be the first Grimm-Wesen hybrid ever. His potential has been speculated for a while now. Perhaps BC is aware of what he could potentially become.