It has been explained by a few on here, but the Avs own the first tiebreaker in ROW over the teams chasing them. Meaning those teams will need to be one point more than the Avs. So if everybody is tied at 94, the Avs will likely get in. Of that grouping you listed, 3 of the 4 are getting in and 1 won't matter to the Avs at all. So really we are talking about St. Louis vs the Avs. St Louis has 3 games on the second night of back to backs against Columbus, Arizona, and the Avs. They likely lose 2 of those 3 games. St Louis matches up pretty poorly with San Jose, so I think that games is a loss. The game in Chicago before the Avs game is either not as important as the Avs game, or critically important. So either they are taking that game lighter and saving Allen... or they are in full must win mode leaving the Avs to face a team coming off a loss, or a tired team. Then you combine that with playing in Vegas for a game and playing the Caps... you should have another loss there. The best I can see St Louis coming into face the Avs is with 95 points, and I think that is pretty unlikely. 91-92 seems pretty realistic to me. In that case, as long as the Avs finish with 94 points they are in, regardless of that final game. Now if St Louis is at 93-94 coming in and the Avs come in at 92... they just have to take care of business before shootout if St Louis is at 93, or in regulation if they are at 94.
Basically, basically win in regulation against St Louis and get to 94. That is the key.