According to the Rules of this Epoch, it wouldn't be a problem for Zhou Tian to enhance his strength in a short time. However, the current problem was that the strong being wasn't a living being from this Epoch, so even if he had some understanding of the World Rules of the current Epoch, he would definitely feel uncomfortable with them.
After all, this world had gone through so many Epochs, but the Rules like the ones now had only appeared in this Epoch. Thus, even if he understood the World Rules of the current Epoch, due to habit, when considering issues, the strong being would refer to the old Rules.