Again, he isn't going to be scratched as long as he is on the team. He's played the most of any forward other than Couture on the PK. He only get's ~11 minutes a game which is the most of the rotating cast of 4th liners but only by about a minute which I attribute to the fact that he plays the most PK time of any of those.
Suomela has close to the least time played of any forward on the PK other than Donskoi/Labanc/Thornton.
He is this years Brown/Burish/4th line plug. But as long as he is killing penalties and the Sharks are top 10 in PK he will continue to get to play over others. The same is true of Goodrow who plays a ton of PK minutes. The coaches obviously like something when it comes to their PK ability that they believe it deserves playing time over others.
I hate him as much as the next person but we need to calm down a bit. One player on the 4th line is hardly the biggest issue we have as a team
Edit: one last point, if we scratch Karlsson, who fills his time on the PK?