I understand the logic behind putting Connor on this potential 3rd line to some degree but it is, in my opinion, somewhat flawed and likely to disappoint. Maurice is once again putting far too much weight on bringing a rookie along slowly by playing against against lower quality 3rd line opponents , and not thinking of the benefits of placing such rookie with quality linemates that complement his style /skills.
Think back to Connor`s superior play in the NCAA. He played alongside Motte(I think it was) and excelled as a finisher/shooter on the line.Clearly Connor never has been one to actually drive the play but is an excellent complimentary piece. My concern is that neither Lowry nor Armia function as play-drivers and this line will be found lacking. Unfortunately, Connor himself will likely underperform.
I disagree with your assessment for a few reasons. First, if you look purely at Corsi when trying to determine the amount of possesion that Lowry, Copp and Armia had last year (likely Connor linemates), I believe that'll be misleading. If you watched those players, they had the puck for a ton of time each shift. However, they were only able to cycle and didn't have any finishers capable of actually getting quality chances despite their possession. In other words, their possession didn't fully translate into shots and opporunties. Playing Connor with some talented players that lean slightly toward the "grinder" side of the coin may be a perfectly acceptable introduction to the NHL and may allow them to turn some of their hard fought work along the boards into real scoring opportunities.
Secondly, what is to be gained from additional time in the AHL? Connor excelled in his time there - given that it's a developmental league, whereby players only play there in order to demonstrate they have the skills to compete at that level prior to trying the NHL on for size, it's clear he's already ticked that box. At this stage I do not believe he is the preferred choice to Laine, Wheeler, Ehlers or Perreault, therefore, the 3rd line is the realistic place for him at this stage.
So, as much as you clearly want to use this to further your vendetta against the coach, i'm not sure it really fits into that narrative. Playing Kyle Connor on the 3rd line is simply the most sensible place for him to be currently.
Hopefully he makes the most of the opportunity, and instead of playing down to the level of others on his line, he instead brings their quality of play up (as a great player can do).