Rakell and Comtois are different type players. I'm gonna invoke some old school type forwards from EASports. Rakell is a dangler. Meaning he seeks opportunity to open up to score. Basically like Teemu and Kariya. What made Teemu and Kariya work so well as danglers is the yeoman work of center Steve Rucchin. Rooch drove that offense, but was never the finisher because he never had to be. That's why Rakell needs a Getzlaf type center to accentuate Rakell's scoring prowess.
Comtois isn't a dangler. He'll get into the nitty gritty and be a good part of a cycling offense. Comtois is a more versatile player in that respect as he's willing to lay the body and know where to be on offense with a defensive mindset of playing keep away when cycling.
I love where Comtois is right now and where he's projecting to become. But I don't know if he'll ever reach Rakell status when Rakell is in the correct situation. Rico and Kes are defensively responsible centers who love to cycle and get to the front of the net. Getz can play that game too, but Getz has a whole other level of creativity. And it just syncs very well with Rakell - the dangler/sniper. Outside of Getz, we don't have that type of center mentality. Look, Rooch isn't an other worldly offensive center. He's a big, defensively responsible center who drives the offense, but has the creativity to play the dangling game.
Rakell is being changed to different lines to find some chemistry. We don't hear Rakell complain to the media. I think Rakell is setting an example in that fashion. Although I wished Rakell would execute at a higher rate, I think things will work out better once Getzlaf returns or Steel starts becoming more confident in his play. A dangler is reliant upon a center who can facilitate that talent. Now, Perry is also a dangler, but he's and odd ball dangler as he likes to park in front of the net and cycle - he scored 50 goals without Getz for most of one season.