That is true, I also forgot Bourque who can fight, but for whatever reason does not. I think Galchenyuk is ready to withhold a bigger role with the team than last year thefore less limited. IMO Toughness>puck posession
Perfect line-up for Ekblad
Stewart fills a need, plus St.Louis needs to add. Stewart had more points than Pleky, he is one of the tougher PWFs around the league, in our prospects we only have McCarron who can is comparable in toughness but he is a few years away of the big league.
Size/Toughness and size can help puck possession. For Dustin Penner and Ryane Clowe are pretty good examples of players who can help possession because size/strength helps them control the puck and Jagr remains a good possession player based a lot on his strength now that he's so slow. Bergeron is one of the best in the league and his grit is a significant factor for why.
However, a great deal of the worst puck possession players in the league are there because for toughness reasons, and most of the better puck possession players.
Chris Stewart isn't a particularly good puck possession player, even for his possession though. And Tomas Plekanec is a very strong possession player at the most important possession position at center. Stewart's value is along the same lines as Bourque's, a big man that can shoot, which is nice but not nearly as crucial.
If your going up against Datsyuk-Zetterberg, Bergeron-Chara and Spezza-Karlsson, you need as much puck control talent down the middle as you can get. And Plekanec doesn't need to be as good as them overall, just close enough that the Habs own superstar 5 on 5 player in Subban can equalize.