Just like the Title says best position groups
Offensive Backfield (QB, HB, FB)
Lions: If Rourke had played a full season, he would be leading the league in every category. Butler is second in rushing, he's also the leading reciever in terms of halfbacks. Mackie is a great blocker and almost had a 100 yard rushing game. Bombers are a close second.
Recievers (WR, SB)
Lions: Have a 1000 yard reciever (Rhymes)and two guys knocking on the door (Hatcher and Whitehead). Cottoy and Burnham have almost 600 yards each.
Offensive Line ( C, G, T)
Stampeders: Blocked for the leading rusher and gave up the least amount of sacks. Even their 6th offensive lineman, has played well.
Defensive Line ( DE, DT)
Lions: They often rotated seven and sometimes eight defensive linemen. Their defensive ends alone account for 29 sacks, second in pass defense and third in run defense. I do think other teams have better defensive tackle starters and depth. The Stamps could also challenge for this spot.
Linebackers (WLB, MLB, SLB)
Riders: Dean, Sankey and Moncrief are arguably the best starting three in the league. Dalke and the Herdman-Reed brothers provide good depth.
Secondary (CB, DHB, S)
Bombers: First in passing yards, second in passing TDs allowed. Only fifth in interceptions though.