Biden is the only establishment candidate in the field. So being the only candidate in that piece of the pie, means he's going to win rather easily. Sanders and the 14 others are going after the same vote. As they smear each other, and wither down, Biden is going to cruise. This is pretty similar to what Trump did in the primary, except the pies were reversed.
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Cory Booker Slams Joe Biden’s ‘Awful’ and ‘Shameful’ 1994 Crime Bill
https://www.breitbart.com/politics/2019/05/31/cory-booker-slams-joe-bidens-awful-and-shameful-1994-crime-bill/