Shattenkirk is insanely, crazily overrated, especially in comparisons with Pietrangelo. Let's take a look at those two, as well as Parayko and Bouwmeester, before and during Pietrangelo's nine-game absence. All stats are 5-on-5, score adjusted. 'PenD' is penalty differential (penalties drawn minus penalties taken), 'OZS%Rel' is the percentage of offensive zone starts, relative to the team (more positive means more time spent starting in the offensive zone), and 'TOIT' and 'TOIC' are the time-on-ice of teammates and competition, respectively (higher is better). Note that Pietrangelo was only out for 9 games, so these numbers represent a small sample size.
Before
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[FONT="Courier New"]Player Gm G A P G/60 P/60 PenD CF% OZS%Rel TOIT TOIC TOI
Pietrangelo 55 2 13 15 0.1 0.8 6 50.3 -5.9 17.3 17.5 19.4
Bouwmeester 51 1 11 12 0.1 0.8 -5 49.1 -5.5 17.7 17.5 18.3
Shattenkirk 45 4 5 9 0.4 0.7 -3 53.2 11.2 16.7 16.3 16.4
Parayko 52 4 10 14 0.3 1.0 0 54.4 3.4 16.9 17.2 16.4[/FONT]
Pietrangelo Injured
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[FONT="Courier New"]Player Gm G A P G/60 P/60 PenD CF% OZS%Rel TOIT TOIC TOI
Bouwmeester 9 1 1 2 0.4 0.8 1 50.7 0.9 17.2 17.6 17.2
Shattenkirk 9 0 0 0 0 0 -2 49.4 4.1 17.5 17.6 16.2
Parayko 9 0 5 5 0 2.1 1 51.1 2.4 16.5 17.4 15.8
[/FONT]
Looking at the periods in which Petro and Shatty were the the #1 RHD, there's just no comparison. Shatty failed to register as a single even-strength point in nine games, despite getting way more offensive zone starts than Petro ever did. He also had a negative Corsi and a negative penalty differential, indicating that he was a drag on possession. At the rate he was taking penalties, he would have taken 18 more penalties than he drew over an 82-game season. Note that this was all while playing fewer minutes and more offensive zone starts than Petro.
Let's compare Parayko and Shattenkirk when they're in the #2 RHD spot. Parayko crushes Shattenkirk in every category except Corsi (although Parayko still has a respectable 51.1%), despite getting much fewer offensive zone starts, playing with lower-quality teammates and against *much* higher-quality competition.
So remind me again why we should sign Shatty long-term for $7m+ when he can't do what Pietrangelo does in the #1 spot, he's only maginally better than Parayko in the #2 spot, and the only thing he does undeniably better than the competition is quarterback the PP (and even then, he puts us on the PK more than the PP)? I'd rather trade Shatty for a forward upgrade, put Parayko in his spot (#2 RHD at even strength, first-unit PP quarterback), and fix our poorly-coached PP that generates among the fewest chances in the league.