Just a note, Karlsson is a poor comparison as he was one of the best defensemen in the league at time of trade and a norris winner prior to the trade. I really haven't seen Chychrun play enough to properly evaluate him, so in my trade ideas I am looking more at stats, trending and expert projections. At the end of the day, he is worth whatever the top offering team is willing to pay for him.
I agree Karlsson isn't the best comparison (he's a RD anyway) but then who is? Who's the last 23ish year old LD to be traded? Here are the comps hockey talking heads mention...IMO almost none are anywhere close:
Burns (pure offense no defense - the Wild played him at wing A LOT) + 2012 2nd for Setoguchi (24 yr old proven pure goal scorer) + Coyle (19 yr old and one of the most sought after kids in the entire NHL at the time) + 2011
#28 pick (Zach Phillips - yawn)
Butcher + 2022 5th for futures (salary dump)
Bear for Foegele (Bear is very good but brings no offense)
Schmidt for 2022 3rd (Schmidt was a journeyman at this point, wasn't very good, and was a salary dump by the Canucks)
Jones + 2022 1st + 2022 2nd for Boqvist + 2021 1st + 2021 2nd + 2022 1st (might be a good comparison but BJs knew they were losing him and everyone knew Jones would command twice the salary (until age 36) of Chychrun (until age 27))
Ekman-Larsson +
Garland for Roussel + Beagle + Eriksson + 2021 1st + 2022 7th + 2023 7th (OEL + Garland isn't a good comp because nobody besides Benning thought OEL (who was 7 yrs older than Chychrun) could play top 4 minutes anymore)
Ristolainen for Hagg + 2021 1st + 2023 2nd (one of the worst trades in the last 5 years. Ristolainen hasn't been the catastrophe most thought he would be, but he's just a regular 2nd line D and nothing at all special like Chychrun has been the last 2 seasons)
Ellis for Myers + Patrick (Ellis was 29 so it's not a great comparison but it's closer than most of the rest of these, even so, it's not very good because nobody thinks Ellis can be an offensive stud like Chychrun can be and he was 6 yrs old with some hard miles)
Leddy for Panik + 2021 2nd (Leddy was a salary dump and he was 30 so it's no comparison)
Graves for Maltsev + 2021 2nd (also a salary dump and nobody ever thought Graves could be a 1/1a D on a good team)
Matheson + Sceviour for Hornqvist (Rutherford swinging for the fences trying to get a 25 yr old failed former and overpaid
#23 overall pick for his own overpaid forward that he didn't want anymore. If this trade had happened when Matheson was 23 it could be a good comp but by this time Matheson was a mess and worth almost nothing in trade except for someone desperate like Rutherford)
Skjei for 2020 1st (not a comp because Skjei was never thought of as a potential 1 or 1a like Chychrun is)
Martinez for 2021 1st + 2020 2nd (Martinez was old and had no potential to be a 1 or 1a, so not a comp)
Miller for 2021 2nd + 2022 5th (Miller is no comp to Chychrun)
Montour for Guile + 2019 1st (there was a time Montour would have been a good comp for Chychrun but not when he was traded by the Ducks, by then he was a 4-6 D, not a 1-3)
Muzzin for Grundstrom + Durzi + 2019 1st (not the worst comp but Muzzin never had Chychrun's offense, which boosts Chychrun's value a lot)
McDonagh + Miller for Howden (2016
#27 pick) + Hajek (2016
#37 pick) + 2018 1st + 2019 2nd + Namestnikov (a nobody throw-in) (if the Coyotes were willing to trade a Miller type player, this would be an ok comp to start with. The problem is that McDonagh was 28 and had proven he couldn't a a 1 or 1a D for the Rangers (he's really good but still needs protected minutes with TB and Hedman being the workhorse) and Miller was an inconsistent enigma when traded. They've both since proven to be vital pieces on very good teams. But is 2018 McDonagh + 2018 Miller worth 2022 Chychrun? I don't think so, so it would take more than 2018 Howden + 2018 Hajek + 2018 1st + 2019 2nd + 2018 Namestnikov (essentially two 1sts and two 2nds) to get 2022 Chychrun.
Jones (21 yrs old) for Johansen (23 yrs old). I'd love this comp but the Coyotes aren't looking for a Johansen type and the Kings don't have one to trade.
Toews for 2021 2nd + 2022 2nd (I'd love this to be a comp because 2020 Toews might be the closest comparison to 2022 Chychrun on this list, but he still wasn't looked at as a potential 1 or 1a. But the real issue is that Lamoriello traded him for 2 reasons: 1. he had a hissy fit because Toews requested arbitration and 2. he knew Toews would win and put the NYI is cap hell. If the Coyotes were in a similar situation to the NYI, this would be a starting point comp.
Trouba for Pionk + 2019
#20 (another one I'd love for this to be a comp but Trouba had already started to show that he wasn't a 1 or 1a and he never was (or has been) the offensive player Chychrun has been.
So, what do you think? Do you see any good comps on this list? Or can you think of any others? After doing all this, IMO it really comes down to whether Chychrun can be a legit 1 or 1a. If he can't he's not worth what the Coyotes are asking. If he can, he is and you have to pay the price because true 1/1a D who are this young just don't come on the market much. At best, you can trade for ones who are unproven like Toews and Pionk, or older ones like Karlsson, 2017 Jones, and (arbuably) Burns.