There was no need to doubt Qin Wentian's strength. He could destroy the Ziwei Divine Court, kill the Ziwei Star Sovereign and defeat Yue Changkong.
In the western paradise, the power of the buddha lords was naturally extremely strong. They were comparable to peak characters from the various hegemonic powers but they might not be able to win against Qin Wentian. The monks of the western paradise had to admit that Qin Wentian has already reached that level and he was among the stronger ones among existences of that level too. If not, how could he have killed the Ziwei Star Sovereign?
However, the monks and buddhas of the western paradise also believed in the Karma Buddha's strength. Qin Wentian wanted to kill a buddha lord of their western paradise in an independent spacetime? It probably wouldn't be so easy.
But even so, it was impossible for them to wait passively.