Adrian always asked the three elders the question of 'who is the most powerful of the three?'. Adrian heard from Ascalor that he is the most powerful, but he knows that he just liked to brag. Koronn answered with a more scientific answer in which that anyone could win depending on the circumstances. Bronx also answered him, but his answer was more akin to the fact that three of them are equal.
Despite Bronx saying that all of them are equal, Ascalor and Koronn actually admitted that they will win if it was just sparring. If it was a life and death match with each of them filled with rage, then it would be Bronx that will be the winner. Ascalor and Koronn know that Bronx will topple them both over if he was serious as he has the most magic resistance among them.