Becomes more a question of handedness and refinement. Archibald's game lacks adaptation or notable upward trajectory on development arc. Unclear what his value-add is over RHS, faster, better forechecker, better scorer (I guess) Rust. Roster addition: RHS, F1 fourth liner Ryan Reaves added to roster. No counterpart for Kuhnhackl added.
Kuhnhackl and adaptation: Bloodlines and development arc towards scoring winger. Determined that he wasn't good enough to be a scorer AND be in the NHL (around 2015 or so) and really re-imaged his game. If you can, go back and track select games from Windsor (OHL) to early WBS to late WBS, major difference in play style and emphasis.
Not to get off on a tangent, but not being good enough to be a top-six forward doesn't make you a bottom-six player...embracing your role as a bottom-six forward makes you a bottom-six forward and a regular in the league (some have enough skill to buoy them until they're ready to give in and embrace it, Daniel Winnik is an example of this...a player who did not want to be a third liner early in his time in the league and it showed in the on-ice product). Kuhnhackl really adapted his game nicely and tailored it to a niche spot and he studied hard on it too, it shows.
He's our biggest bottom six forward outside of Reaves and as a LHS who can play LW and RW, he provides a good matchup scenario against RHS...he's also better defensively than other LHS players on the team (except Crosby).
I like Archibald. There is nothing amazing or special about Kuhnhackl...in fact, I kinda wish Archie was kept over him just so I don't have to hear that "Player of the Century" line about his dad every time Kuhn touches the puck on any telecast throughout the league. But I can live without Archibald, there's a number of him in the league, there's a better version of him on the team already. Kuhnhackl is the tactical choice in my opinion...