I think there were some big winners and losers from the IA caucus.

Big Losers:
Joe Biden - under performed the polls by ~6% and likely finished 4th, "Mr. Electable" my ass LOLOLOL.
Iowa Democratic Party - for either being entirely incompetent at best or corrupted at worst.
DNC - even though this really isn't their fault Trump has already weaponized it against them, and Trump has MORE than enough foils already and the dems handed him a big fat one with a bow on it.
Buttigieg - he lost millions of dollars of free MSM coverage that he should have got for finishing so strong, and honestly that is the only reason anyone campaigns hard in IA and Buttigieg was basically "all in" in IA.

Big winners:
Bloomberg - Since IA puts a huge question mark on Biden's electability (and NH may accentuate that point) and if Pete falls off once he gets out of pure white states and into NV and SC (as he polls horribly with minorities), Bloomberg can swoop in on Super Tuesday with his half a billion dollars and the moderate wing can consolidate around him.
Trump - The moron democrats keep handing him big fat foils all wrapped up nicely.
Bernie - He will come away being tied or within 1 of the most pledged delegates and likely the popular vote lead in both "rounds", he can claim victory even if buttigieg is ahead by 1% in SDE's at the end of the day (when ever that is ffs).  As the lefts anti establishment candidate the shenanigans in IA by the establishment will rally his base and might give him some boost with some indy's or under 50's.