The Shadows' goal was one that they might have difficulties trespassing in their existence, but they would never give up because they wanted to be able to stay by his side.
Tianlong Yun was not only their role model and their goal but also their closest family. They would do whatever needed to be done in order to stay by his side without lowering their heads.
On the other hand, Tianlong Yun was extremely satisfied with his little siblings as not only were they trying hard to surpass his expectations, but also helped him out of the distrust issues.
That's right if it weren't for Tianlong Xia, Tianlong Yue, Lu Bing, and these shadows, he most probably wouldn't trust another living soul ever again and think only for revenge.
Living only for revenge is a great boost, and purpose to grow strong fast, but that is only until you achieve your revenge, as after that your whole life would be just empty.