Before his first fight with Toney?...I think it was the sanctioning fees of the WBA and they wanted McCallum to fight Steve Collins again...Arum wanted the Toney/McCallum fight.
If memory serves, McCallum beat Collins already, and Collins worked his way back to number 2 I believe, and wanted a rematch, but McCallum wanted Toney, and when McCallum refused to fight Collins, Collins and Johnson fought for the vacant title.