Gray Wolf's idea was to let them fight each other, the fiercer the better. He wouldn't help anyone, and it didn't matter who suffered or gained. He just wanted to watch a good show, and ultimately benefit as the fisherman, and ideally step in to clean up the mess.
Of course, the three guys Gray Wolf threw out weren't completely out of combat capability. Gray Wolf was quite measured in his actions. He understood Uro Iji's close-combat skills, which were almost stronger than Gray Wolf's own. So even if seven Iron Blood Members surrounded him, they wouldn't necessarily defeat him. So, by doing this, Gray Wolf managed to balance the combat power of both sides. If the disparity was too large, it wouldn't be fun.
Therefore, those three people who were injured by Gray Wolf were also quite sensible, knowing they were no match for Gray Wolf. It would be better to deal with Uro Iji instead of wasting their efforts on Gray Wolf.
