Yeah, we're on the same page RIAL with Jones and Dumoulin.
Jones is the right stylistic fit for the Avs. Size, two way game, PK ability, some offense, big point shot, can step into a top pairing or PP1 role if Makar goes down. Brings a true Big 3 on D, no offense to G or Manson.
Dumoulin also brings size though isn't very physical, good defensively, can fight, is mobile, another PKer, another vet with lots of playoff experience, shouldn't cost too much to acquire.
Takes Cale off the PK so you can go with Toews, Jones, Manson, and Dumoulin.
Avs become much harder to play against, which has been an issue for the D core in the playoffs in recent years. Also the perfect blend of offense/defense/size/mobility to play any way you want against any opponent in the playoffs.
Toews - Makar
Girard - Jones
Dumoulin - Manson
Would be the best D core in the NHL IMO. Six good defenseman, with lefty-righty combos on each pair, each playing with a partner that's a good stylistic fit for them, everyone slotted into the appropriate role in the depth chart that suits them, and they can switch up all the D combos if they need to, since nearly all the lefties and righties are a good stylistic fit (except G-Makar IMO) for each other too.