6th in ATOI this year
7th in ATOI last season (among guys who played at least 30 games)
5th in ATOI in 15-16
You have to go back to 14-15 to see when Gunnarsson was a #4D.
Rather than being lazy and assuming that ATOI is the only representation of a defenseman's role, let's look at Gunnarsson's partners last season (these numbers are for all situations):
Partner | Pietrangelo | Parayko | Bortuzzo | Dunn |
TOI | 419.23 | 277.08 | 216.85 | 54.48 |
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Gunnarsson's 5v5TOI% was 5th on the Blues, IF you include Bouwmeester's 35 games played. His 5v5TOIQoC% was 28.9 which would easily be considered 2nd pairing level. Gunnarsson played the majority of his ice time (over 70%) on the first or second paring w/ Pietrangelo or Parayko. Particularly after Bouwmeester's injury, Gunnarsson was asked to play a very large role in our top 4 last season.
There are several reasons Gunnarsson's aTOI is misleading. For one, he rarely played on special teams. Gunnarsson was also playing above his head, which lead to the team trying to limit his exposure and minutes. When the team needed a goal late in a game, Dunn would often play with Pietrangelo instead of Gunnar. When the team needed to protect a lead late in a game, Edmundson would often play with Pietrangelo.
In other words, Gunnarsson might not have logged as many minutes as you might expect from a true top-4 guy, but his 5v5 usage was generally WAY tougher than the average bottom pairing dman. For comparison, Bortuzzo played exclusively on the bottom pairing last season and his 5v5TOI%QoC was 28.23. This may not seem like a huge difference, but Gunnarsson's QoC (28.9) was much closer to Pietrangelo's (29.36) than Bortuzzo's (28.23).
Personally, I think Gunnarsson played enough on the top pairing against top competition to qualify as a legit top 4 guy last season. In general, I would classify Gunnar as an excellent #5 who can play up the lineup in the top 4 for extended stretches without looking TOO out of place.