Yeah... not sure about the bolded. Hamonic is better than Z, but not as much as you make it out to be. The other problem with your argument is that even though I love Chabot, he hasn't really made his partner better up to this point in his career. I mean, how long has the team been looking for a partner for Chabot? I'll answer that, ever since Demelo left. So no, I'm not comfortable in having Hamonic playing close to 20 min on the first pair, and not sold Chabot can "carry" anyone.
Zub and Chabot worked last season to start. We need a dependable pair to play 20+ min. Hamonic started getting exposed after a couple of games with the Sens. He ain't it.
I want to start off by saying this defensemen slotting talk is all if we don't get a top 4 RD and run with what we have.
On Hamonic: to me, he looked like a physical, defensively competent, bottom pair guy. I don't think he was exposed at any point, he just isn't a top 4 defenseman. Zaitsev consistently looks like a guy who's only NHL caliber trait is his skating. I see one as solidly an NHL player and the other as a non-NHL player.
On Chabot: Chabot has been mostly paired with Zaitsev since we traded DeMelo. He also played with Hainsey (I don't have ice time or advanced stats for this on me) a very, very, very small amount with Gudbranson (80 mins, 53% corsi but Gudbranson looked bad everywhere we put him), and Zub (about 400 minutes over two seasons, 50.2% corsi but have looked great). We haven't really tried to find a partner for Chabot other than forcefeeding him Zaitsev, so I don't think your point on Chabot not being elevate his partner is valid. He's played with a left shot retiree, a non-NHL player, a guy who looked bad on all three pairs but with whom he had decent stats, and Zub. I think Chabot has been fantastic individually for most of the above time period. He struggled at times in the bubble season, but he has been a transition machine otherwise, and the entire team's only breakout option for years until Stützle started coming on this season. A lot of people seemed down on him last season, but in my opinion he was, as usual, our best player. Chabot also has never had support from a second pair, something he would have with Sanderson - Zub playing behind him. This should alleviate some of the pressure he normally has.
Chabot is a great player that has been dealt terrible hands by our GM. He's been expected to carry our entire defense and breakout like Karlsson did despite not being as good. While he's not Karlsson good, I fully believe he is good enough to transition the puck like he always does while playing with a suboptimal partner, especially if it helps the team create, for the first time since Chabot was the guy on our defense, a good second pair.
Additionally, depriving Sanderson of a truly dependable partner feels wrong for his development and for the team to me. You're asking so much of a rookie defenseman who hasn't even had the offseason to train. You wan carry our second pair by himself? Seems far less effective than putting Zub there and letting Chabot continue his solid individual play.
Again, ideally we bring someone in, but this conversation was on the premise of that not being an option. Again again, as with all pre-training camp roster and lineup talk, lots of other things could happen. This is just how I look at the situation and what I think is best for the players and the team. With that said, I really hope they do what I've suggested or go out and get someone. If not, I forsee Chabot - Zaitsev as a mainstay in our future again.