What if Buttiegieg wins Iowa, Sanders wins New Hampshire, and...

[TDAS04]

They each come in second in the other state.  Pete and Bernie are the top two finishers in both Iowa and New Hampshire.

[Pheurton Skeurto]

Biden will probably still be the nominee.

[Lord Halifax]

Sanders wins NV and Biden wins SC. The rest of the primary is a two-horse race.

[Amenhotep Bakari-Sellers]

Sanders wins NV and Biden wins SC. The rest of the primary is a two-horse race.

Biden is ahead in NV, it wont matter, SC and most of South will be won by Biden

[Lord Halifax]

Sanders wins NV and Biden wins SC. The rest of the primary is a two-horse race.

Biden is ahead in NV, it wont matter, SC and most of South will be won by Biden

You're right that it won't matter that Biden is ahead in NV at the moment if Sanders wins NH.

[redjohn]

If Bernie comes in second in IA and first in NH, he wins Nevada. Biden wins SC by an underwhelming margin, and then the rest of the race is between Bernie and Biden. Expect Bernie to campaign much harder in the deep south and TX, which he likely won't win but he can close the gap further to limit Biden's delegate wins in those areas. He'd win almost all the other contests on Super Tuesday.

[Xing]

Then Biden probably wins, unless Sanders also wins Nevada by a decent margin and comes closer than expected in South Carolina. I think the main way Biden loses is if one candidate wins both IA and NH (and better yet, NV as well.) And Sanders and Warren have a better chance of doing that than Buttigieg.