His shot % is 8% higher than his 6 year average, so it's questionable whether he'll stay that high in the goal scoring race.
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The same could be said about Matthews, Toffoli, Boeser, Brown, Scheifele, Pavelski, Couture, Connor and Van Riemsdyk , Marchand, Gaudreau, Stamkos, Dvorak, Pastarnak, Backstrom, Kreider, Pageau which all have a higher or similar s% than Anderson currently and are ahead or tie with him in goal this season.
Matthews (22 vs 16. 2 career)
Boeser (20 vs 13.6 career)
Brown (29 vs career 9.9 )
Scheifele (25.6 vs career 16.3)
Pavelski (27 vs career 12.6)
Couture (20.8 vs 12.8 career)
Connor (17.5 vs career 15.6)
Van Riemsdyk (25 vs career 12.2)
And I could keep going with a bunch of 9 goal guy shooting in the 20+%.
Point being he is for from being the only one with an abnormally high shooting percentage . Actually his is more sustainable than a lot of other current top scorer.