First bolded: Berglund can play LW / C / RW. He's underrated at center position. Most of his goals comes from tip in, deflections or just scramble at front of net. Berglund has decent shot, but with his big body I think his game is best when he's front of net --> powerplay screenplays.
Second bolded: St. Louis Blues- Face-off stats - 2017 - Puckbase
Berglund have improve his FO skills and I believe previous years his FO% was bad, 'cus he had shoulder problems, now he's healthy on that part and clearly it shows FO% what was last season 55.1%. Ofc sample isn't that big, but you can see the path on previous seasons.
Overally Berglund is underrated and look my avatar, long story short, I hate him. He's streaky forward, when he's super hot, he's elite forward and you love him (I don't), but when he fall down, you can't even see him on ice in good way. But as a 3rd liner, you get forward who is ~20 goal scorer (which is in my mind-blowing knowing how bad he's generally). Underrated FO guy, possession monster and
guy who doesn't afraid to be physical when needed.
When he's doing some funny stuff at ice, you can always posts a gif about him in GDT. Hint: there is a lot of them.