What makes you think Byram doesn't have #1 upside?
Actually, the most important position in hockey in defense. Defense wins championships. Go ask the Oilers how their 1-2 punch is doing. What team has proven you can win with mediocre defense?
I'd argue that our defense let us down last year, to the tune of Graves and Nemeth. If we win the cup this year it will be because of our depth at D, having Byram playing 3rd line minutes. When you can rely on every pairing to be reliable, that's a huge competitive advantage. That's our mistmatch. Right now our #3C is Compher. So this iteration of the Avalanche might even prove you wrong.
I'm not saying don't address the C issue, or don't try to acquire great center depth. Just don't do it at the cost of a likely top pairing D man. Those are much harder to acquire, and much more valuable than a #2C, which can be found at a relatively reasonable price via trade or free agency. i.e. Trocheck
And why even consider trading Byram when trading Girard makes 10000x more sense, and with an add or 2 can prove the type of player we need?