You have a point but Aunt Marie lived by what she told Nick. Even Nick's father was killed because he was connected to a Grimm. In season 5 I don't see this as even a question. They may hint at something for season 6 but it will play a very minor aspect of season 5.
IF and when the do get Nick back out into the world the who must be able to handle themselves and know the wesen Grimm world. Anything less will be setting up a Juliette type scenario.
IF and when the do get Nick back out into the world the who must be able to handle themselves and know the wesen Grimm world. Anything less will be setting up a Juliette type scenario.