Your proposed 2nd line was tried and didn't work the best. Huberdeau has been playing his best hockey on the team with Sharangovich and Kuzmenko. Kadri with Zary and Pospisil has been consistently one of our best lines this season

The Flames lines as is are about as good as it gets and they’ve been playing extremely well with them. I’d just like to have a better Centre than Sharangovich

Flames really don’t want to separate Kadri & Zary or Huberdeau & Kuzmenko and Mang-Backlund-Coleman should be kept together as well, the latter group are dominant with puck possession together

Pospisil plays an integral forechecking, grinder and pest role, so should be on the ice as much as possible. Pelletier & Rooney are good together as well and should be eased back from their injuries in the 4th line

Hanifin & Tanev will be gone soon and Oesterle sucks. Much rather have Pachal or even Gilbert in over Oesterle

Hubey, Backlund Coleman was a line for around d 20 games didn't work.
Mangi, Backlund Coleman has been one of the best possession lines in the league the last 2+ seasons.
I like hubey with sharangovich and kuzmenko, gives him 2 shooters to try to pass too. Only problem is Sharangovich isn't very good at face offs.
Haven't heard an update on pelletier, hope it's nothing serious. I wouldn't mind him playing higher in the line up, but the 4th line looked pretty good with him.