Not sure what other Avs fans said, but Avs sold high on Byram. He was awful this season and I would take it a major reason why is because he needs the puck to be effective. You won't be able to do that with Makar and Toews being older and more talented at this stage. His entire WHL campaign that got him drafted in the top 5 was him pretty much acting as a rover due to his talent dangling kids with moves that would never work in the pros (this was one of the reasons why I disliked the pick at the time). Now, this isn't to say he doesn't have talent, he absolutely does, but in a reduced form compared to where the Avs probably saw him.
The problem with Byram is that his play away from the puck is lacking in a lot of regards, he keeps pushing for offence and strictly offence because that's all he knows. He wants the puck and dangle through blokes and snipe it. I made the comparison earlier on our board, but at this point, he was going the route of Matt Dumba 2.0. A very high-risk defender who thinks of only offence for the sake of the defensive game. This doesn't mean he's not trying to learn the defensive game, but I don't think at this point, he will ever come close to being an average or above-average defenceman in the defensive zone. Not that you need him to be that, pair him with a shutdown bloke like Samuelsson, he might be able to do wonders and play the style he wants to play.
You lot got him to push the play offensively and for the transition game. When Avs won the Cup, he was one of the most steady defenders of anyone. He got the easier minutes but did wonders with them. Now, other Avs fans will state how the "Avs won the Cup because of Byram," those are overvaluation of his play. He was very good in the Cup Finals, but he was not the breaking point between Avs winning or losing the Cup; Avs were always going to win the Cup with the Lightning injury list. I don't think he was as immense in the defensive zone as other Av fans will say, he primarily dominated in the transition game and fed quick pucks up to the forwards. He was good in the defensive zone, though, that seems much more of a fluke or an enigma at this point than a norm.
He still has immense talent, but definitely was on the decline. If he's able to find some traction, you're looking at a #2-3 offensive-gifted defender with a knack for goalscoring and many brain-dead defensive plays - he could eventually become a 15-40 defenceman. I would consider him more as a #3 with heavy offensive zone minutes along with the usage of Tyson Barrie when he was part of the Avs. If he's able to clean up his defensive zone plays, he will be more along the route of being a #2 defenceman. Sorry, I am short on time so I am not proofreading this post.