Don't take this the wrong way, but going from this, and your post in the Enstrom/Buff thread, I get the feeling you tend to make more out of a handful of mistakes then one should or is necessary. Mistakes from our top 4 will happen no matter what. They'll be facing the toughest competition all year long and you won't be completely shutting down teams' top lines every night.
The two things I felt like Trouba has done real well this year was to limit his mistakes, and at times be a gamebreaker while not hurting the team. He would have obviously hit a wall at some point, but I don't think it would have been as bad as you might think. He seems to have enough smarts between his ears to limit how much of a down period he would eventually have. He reads plays well.