My post this morning was submitted before Bloomberg withdrew and endorsed Biden. I don’t know when the moderators approved and posted, as I was in court today from 10:15 on.
Sanders has previously said he would support the Democratic nominee, he won;t run as a third party candidate.
Brokered conventions were the norm for more than 100 years. Having a candidate with enough delegates for the nomination on the first ballot was unusual (unless an incumbent running for reelection).
It does not mean a party cannot get along, rather that they came to choose a candidate who garnered the needed number of delegates.
State delegates to the National Convention (and I have been one) are only pledge to a specific candidate for the first ballot. Then the horse trading begins