With regards to catching the Devs, this is where the math gets you:
Currently the Devs average 1.16 points per game (58.2% of their possible points), currently the Rangers average 1.06 points per game (53% of their possible points).
If the Devs average 1.16 PPG over their final 15 games they'll end with 95 points, meaning the Rangers will need 25 out of a possible 32 remaining points to tie the Devs, which would be 78% of their possible remaining points, well above the 53% the Rangers are at now (and the Devs currently own the tiebreaker).
Even if the Devs go down to 1 PPG over their final 15 games, they'll end with 93 points, meaning the Rangers will need 23 out of a possible 32 remaining points to tie the Devs, which would be 72% of their possible remaining points, well above the 53% the Rangers are at now.
Even if the Devs go down to .666 PPG over their final 15 games, they'll end with 88 points, meaning the Rangers will need 18 out of a possible 32 remaining points to tie the Devs, which would be 56.25% of their possible remaining points, still above the 53% the Rangers are at now.
Bottom line is unless the Devs collapse AND the Rangers play very well, the Rangers have no realistic shot to catch the Devs. Realistically, it's one spot remaining (if Ottawa struggles that spot could maybe be in play still - but it's a longshot), which is currently held by CBJ, meaning tonight's game is absolutely huge if the Rangers want to have a shot to make the playoffs.