It's probably the Chisaki is working under shigaraki because he realized how much stronger shigaraki is, so chisaki doesn't want to be his enemy. Addelinemo
Good point, but without his arms he doesn't have any power, so how could be helpful to Shigaraki?
Aaawww ε=ε=(ノ≧∇≦)ノ
The latest chapters are so fanservice