this doesn't make sense to you? Granlund needs better players around him due to inexperience and (apparently) strength issues, which he should grow out of it. Temporarily he needs better/different linemates to be effective.
Seto should get a shot to play with Parise and Koivu. He was really effective in SJ with Marleau and Thornton who were also really good puck possession players as are Zach and Mikko. And I think him and Parise could be really good because they both have good speed. Seto is a talented enough player to be a big piece of this team and I think this would be his best shot to try and prove me right. If he is still ineffective with those two then you maybe see if you can get enough value out of him to warrant a trade.
As far as Granny goes I'd like to see him on a line with Coyle because they had good chemistry in Houston. And I think adding Heatley on the other wing would be good as well. That gives Granlund a "sniper" in Heatley and another big guy who can win battles and clear space for Granlund while also having enough skill to put up a lot of points.