When Sakic took over as the Avs GM, they had made the playoffs 3 times in the previous decade. PA Parenteau was tied with Duchene as their leading scorer the previous year. Matt Hunwick was on the first defensive pairing with Tyson Barrie. Greg Zanon was playing 19 minutes a night on the second pair. They finished with 39 points over the 48 game season, 2nd fewest in the NHL.
Over the next 8 years, he drafted MacKinnon, Rantanen, and Makar. Cleaned up Lacroix's mess and traded ROR. Traded Duchene for a haul. Traded for Kadri, Toews, Burakovsky, Lehk, etc. Signed Nuke when Dallas didn't qualify him. The team he built went 20-4 in the playoffs and won the Cup, and could have potentially gotten one or two more if not for some unfortunate injuries and Nuke getting suspended. And that window isn't closed yet.