https://fivethirtyeight.com/features...ed-convention/
A brokered convention is not a likely occurrence, exactly. But it’s not unlikely, either. It’s roughly as likely as the Tennessee Titans beating the Baltimore Ravens earlier this month, or Donald Trump winning the Electoral College despite losing the popular vote. According to the FiveThirtyEight primary model, there’s a 15 percent chance that no Democrat wins a majority of pledged delegates
however, he makes a distinction between a brokered convention vs. a contested convention. the way it operated is different prior to 1970.
He says the distinction between the 2 in todays politics is minor, as far as terminology goes, they're the same thing.
He doesn't mention Bloomie until the very end of his article. He says bloomie is a wild card that polls can't adequately predict the turnout.