(Not particularly at you DH, but feel free to respond)
How do you even define a 1st vs 2nd line player? It's is thru scoring metrics? Jake, TK, JvR, and Lindblom are all in the top 66 of 398 forwards of total 5v5 points/60 who played 300 min or more this year. That's 83th percentile for scoring. TK, Lindblom, Giroux and JvR are all in the top 80 of 398 for xGF/60; that's the 80th percentile for scoring.
I feel like people don't understand what first line talent really is, or feel as though you can only have 'elite' talent on the first line. Couts is the best player on the team and I would consider him an elite player (still don't fully know how to define that). I would certainly say TK and Giroux are first line players. I would say Jake and Lindblom are first line caliber players as well.
But the whole idea of 1st vs 2nd vs 3rd line is moot without a discussion on deployment. AV doesn't really spread out 5v5 TOI to make much of a difference. I mean, Couts played 13:58/GP (the most) and NAK played 10:05/GP (least) for him.
The way this team is constructed is thru it's depth. They have the ability to put a legit first line together and two additional very good scoring lines together. My lineup would look something like this, barring trades:
Lindblom-Couts-TK
JvR-Hayes-Giroux
Farabee-Frost-Jake
Raffl-Laughton-NAK
PP1: JvR, Farabee, Giroux, Jake,
PP2: Couts or Hayes, Lindblom, TK, Frost
In this scenario, I would like to see that top line playing 15-16 mins a night at 5v5. All three of those players are better at 5v5 than PP situations. Leverage their skills the best you can. The second and third lines are going to get 12-14 min of 5v5 time, and get additional PP time. The bottom line gets about 8-10 min of 5v5 time.
For most players, "top 6" is a better term than first line, as we've seen, scoring depends on your linemates, the year Voracek and TK both played with G and Couts, both had their scoring fall off when they played on the 2nd line, TK more dramatically than Voracek b/c Voracek was the better player.
So to me a "1st line player" is elite or just a notch below, and other players benefit from playing with those players. The players who are interchangeable in the top 6 are "top six players," and that's the majority of players on 1st lines. And we see that, these kind of players are often shuffled between the top two lines by HCs looking for "chemistry."
Malkin is a good example, he plays on the 2nd line but is a 1st line talent, on most teams he'd be the 1C.
Sheary, Rust et al may play with Crosby on the 1st line, and pad their stats, but are they top six talents?
So you have:
Couts - our 1st line driver
G, Voracek, Lindblom, TK, all could play on either line, depending on their roles.
Middle six is a way to categorize guys just below the top six tier but better than most bottom six players, they can move up or down.
Hayes, JVR, Farabee, Laughton are really not top six players, though Farabee will be in a couple years.
Hayes is tricky, I think he can be a top 6 RW, but I'm not sold on him as a top 6 center.
JVR scores at a top six rate, but has ended up on the 3rd line in both Toronto and Philly, so HCs like to shelter him.
Frost, Patrick - top six talents but total unknowns right now (potential is a dirty word and health is an issue)
Bottom six are guys who simply lack the skills to be credible in the top six long-term, Raffl played on the first line but he's not a top six player.
4th line guys are primarily energy guys who lack the skill to be given a larger offensive role, Pitlick is a perfect example, when asked to do more than forecheck his offensive deficiencies were glaring.
Raffl, NAK, are bottom six guys who are credible on the 3rd line
Bunnaman, Twarynski, Sushko would be considered 4th line until proven otherwise.
Sandin, Laczynski are potential 3rd line guys but may start on the 4th line.
Allison and Ratcliffe are potential top six forwards but may need a couple years to see if they develop.
Brink has top six talent.