For much of this season, the Colorado Avalanche had six Stanley Cup-winning defensemen in its lineup. Those six guys had combined to play 100 of the 120 games available at the position two years ago when the Avs stormed to a championship. Four players — Cale Makar, Devon Toews, Bowen Byram and Josh Manson — played in 20 playoff games. Samuel Girard (seven) and Jack Johnson (13) split one of the other two spots, while Erik Johnson held down the other. Fast forward to now, and it’s possible the Avalanche will start its first-round series against Winnipeg with two defensemen who each have two Stanley Cup Playoffs games apiece: in-season additions Sean Walker and Caleb Jones. “The atmosphere is at another level, and the intensity gets ramped up,” said Walker, who appeared in two playoff games for the Los Angeles Kings last season.