It is not about the individual player but a team as a whole. I agree that sometimes those lines have not worked well, especially the defensive pairings.
About Vidgren, he has been known to be a good forward against the other teams top players and a pk specialist so yeah, he is good defensively, great even when he has a good like. He started as our 4th line winger and he has been effective both ends of the rink. The roles are simply in that line at the moment. Vidgren is the muscle, Lahtinen is the playmaker and Kemell is the scorer. Lahtinen has great hands but too often tries to make a flashy move but ends up losing the puck. That is the main issue with that line and the face offs. Vidgren being a winger, he rarely wins a face off. That is it at the moment until JYP gets that center they are looking for.
And yes, I am a JYP fan unlike you and unlike you, I have seen all of JYP's games this season.