01-12-2018, 07:51 AM
When Nick was the only Grimm in town, he had value for Renard. Truble was introduced help Nick when he was unGrimm, Hank and Nick could suspect it was a wessen crime, but they couldn't find out who was the right wessen without her help. In the lake monster episode, the sheriff said they had a reputation of solving strange cases, without Grimmness Nick was once again a normal detective, therefore useless to Renard.