Labeling guys as 'A grade' or 'B grade' doesn't actually acknowledge the end statistics which show that Collingwood doesn't win the football at any sort of level. The best teams in possession differential are GWS, the Bulldogs, and Sydney.
If the aim is to compete for a premiership, the midfield needs to get more football than the opposition. Collingwood don't do that on a consistent basis...at all. You can't really rate them in a top 6 midfield despite what you think the quality of the players are as individuals.
Collingwood was 6th highest in CP differential behind the 4 preliminary finalists and Melbourne