Most of them had chosen to admit defeat at this time. They felt that Jack's power could bring them luck. They would not leave Jack.
The black dragon looked at all his people and decided to turn to Jack. He also chose to turn to Jack, because he couldn't lose them.
His planet would be plundered by others. He couldn't bear this huge blow. In the end, he chose to rely on Jack.
If what Jack said was true, he could gain great power from Jack.
"Just come to me before I say those words to you. I won't do anything to you. Now welcome to my team. This is a gift for you."
They had already gone through a battle here, and their energy had been weakened to the minimum.
If they wanted to be his soldiers now, they had to at least enhance their strength.
Jack generously gave them the magic ball. They were all surprised to see it.
We think they have met a good master now. How could they not be loyal to Jack?