Raze knew at some point Idore would join the fight. He always did in the past, but usually it was the other way around. When Raze went to go after Idore, Trubin would be there, and he would need to retreat.
When Raze had attempted to get to the Grand Magus in the past, he had to calculate who was easiest to target first, and since Idore although the leader wasn't claimed to be the strongest, Raze did go after him from time to time, but it would always end in failure. Either Trubin would intervene, or the situation would spiral out of control before Raze could properly isolate him.
This time was different.
