Anyone expecting Byram to be Makar is being delusional and unfair to Byram.
The hope is that he turns into a top pair defenseman, hopefully an all-star, but to hope he becomes an equal to arguably the greatest defenseman to ever play in the NHL is completely unfair.
My hope is that Byram is one of the best #3s in the league, eventually, and can lead the second pairing lock-down consistently. PP2 leadership from the point would also be nice, eventually.
First pairing will likely belong to Makar and Toews for the foreseeable future, but that actually works well, as Byram's got potential to be that solid anchor on the second pairing. Takes pressure off of him, while still allowing him as large a role as he can handle. We do need that RD for Bo, at some point, unless Manson rejuvenates.
My hope is that G comes back perfectly healthy and mentally well, when he is ready, but that Bo has stepped up in the interim and owns the left side of the second pairing. In this idealistic scenario, we send G to Buffalo for a reunion with EJ (and some sort of asset in return).
As an aside, if I had been in Girard's shoes, the pressure and anxiety of realizing that despite your play, you are likely to be pushed down to the third pairing in the next 1-2 seasons... it would eat at me also (at that point you realize you are overpaid for your role, albeit not necessarily ability, and that while you're overpaid others are taking "team friendly" deals). Losing his partner in EJ was icing on the cake, and of course as an organization Avs should stand by G come what may as he recovers; however, in a scenario where the team composition and where he slots in was causing this distress, that stress is unlikely to change, and the solution could be a change of scenery / opportunity to be that second paring D-Man.