Not hard to imagine Sanders being the only candidate getting 15% and claiming a majority of the delegates (presumably someone would clear 15 in a CD or two)
And yes, there's realignment. But if you're not over 15% on first alignment, second alignment doesn't necessarily grow your SDE count much
Many of you are missing the point. If your aggregate tally on first alignment, statewide, is much less than 15 percent, you are not favored to increase your statewide tally on second alignment bc you get 0 as often as you gain from 2nd choice. See IA 
Now, the second-alignment to SDE conversion could then get you back over 15% if you excel in low turnout precincts. That's a separate question and presumably it could help one of Sanders' rivals get over 15, as it did in IA, but it is not one I have formally evaluated
All this taken together, I think you'd expect *someone* other than Sanders to work their way over 15. But it's fairly easy to imagine otherwise, given the trendlines and super crowded field
And a modest correction--they use county delegates not SDEs in NV. This is substantively identical to SDEs in Iowa (SDEs are just county delegates weighted to adjust for varying county delegate:vote ratios per county convention)
