You have no facts.
The brokered convention is 193 years old having begun in 1831 and stopped in 1968.
In those 193 years, each party has won the WH and each party has lost the WH based on who their candidate was.
Democrat FDR won the nomination during a brokered convention in 1932 and won the WH in 1932 and THREE MORE TIMES thereafter.
Democrat John F Kennedy won the nomination during a brokered election in 1960 and went on to win the WH.
Read more, perhaps?