Although I do agree with Coleman's qualities that you just stated, but if you implied that he has more value, or that he add more value to a team than Tatar I strongly disagree. the difference in salary is not big enough for the difference in the quality of the player..Tatar's not making 9 mil..
Contending teams are usually up against the cap at this time of year. Coleman cost so much because he's signed past this year AND due to his cap hit being so low. If the cost outweights the benefit, then teams won't trade for that player. Considering Tampa will likely be right back up against the cap next year, Coleman is more valuable to them than someone like Tatar.
The Avs don't need guys on cheap contracts at all and won't pay through the nose for one.
At the time, Rantanen/Kadri/Wilson were not injured long term. There is certainly some pressure on Sakic to do something. If he strikes out on Kreider, Bergevin will have quite a bit of leverage since he's not even forced to trade Tatar and quite a few teams seem to have interest.
It doesn't matter if there are injuries on the team - Sakic doesn't make panic moves and the team is positioned well enough right now that they aren't at risk of missing the playoffs unless something goes seriously wrong. Besides, the team kept winning when Rantanen, Landeskog, and Grubauer were all out with injury earlier this year, and they can do it again.
obviously byram wouldn't be included but newhook/timmins are a tier below.
Not to mention your whole point doesn't make any sense since hall was a ufa and tatar still has an extra year.
Newhook is barely a tier below Byram right now. He's torn up the NCAA as a freshman - he had 8 points in the last 3 games. And his coach is putting him in key defensive positions because he's trusted as a two-way player.
Timmins has been given the confidence of the Avs' org since day 1 and they continue to value him as a future top-4 defenseman. His value to the Avs is higher than his value to other teams, and if other teams want him, then they need to either meet or beat his value to the Avs.
Not to mention one extra year for Tatar doesn't bring his value up to that of Hall's.