As far as the whole "he's the captain" thing, Torts just said he needs to be better. I don't even know if I necessarily agree with that or that you have to agree with it, or whatever the case, but it has nothing necessarily to do with leadership.
Jacob Trouba sucks ass. If it were up to me, I would scratch him like eczema. That being said, anybody in the know in regards to the Rangers would tell you the guy is beloved in the locker room.
Now, should you put up with a guy that sucks because he's a good leader? Should you name a guy captain if you feel he can't stay in the lineup? That's a whole other discussion.
Point is, you can be a leader and still have a stretch where you're not effective. A scratch is not necessarily effort-related.