Are they first line centers

No (winger) - Absolutely not anymore - Yes
Not even close - Yes Cerebral Center - Is he primarily a center? If so Yes
Yes on most teams - No, Great 2C - No Winger
Yes, but not sure if still is next year - Yes - Yes
Kinda, but better suited for 2C - One of the best - Great 2C
Yes, easily - Yes - No, good 3C
No, see Backstrom - Great 2C - Decent 2C, Great 3C
No, 2C if healthy - Kinda? more of a great 2C - Yes
Yes, but we'll see about next year - Yes, despite what people say - Yes, even with defensive woes
Yes - No, 2C - Need to see another good season to say yes
Not close, projects to be a 2C - As of this year I'll say yes - Yes easily