If given the chance, Zhou Tian could easily kill any of the Ancient Powerful Beings, but without the opportunity, Zhou Tian need not even take action—it would be impossible for any Ancient Powerful Beings to catch his tail. Furthermore, if it's uncertain where Zhou Tian is, then the idea of those Ancient Powerful Beings killing Zhou Tian is nothing short of a delusion.
Unfortunately, although it was said at that time, Zhou Tian could not possibly coexist peacefully with those Ancient Powerful Beings for his own objectives. Thus, it was predetermined that Zhou Tian would inevitably have a battle with them, and under these circumstances, Zhou Tian had to be extra cautious with his actions.
Thankfully, despite that Zhou Tian would not end up well if those Ancient Powerful Beings ever caught him, but given Zhou Tian's strength, so long as he pays a bit more attention, it wouldn't be an easy task for those Ancient Powerhouses to capture him.