I was rewatching Ex-Aid recently and noticed something:
While Cronus do indeed spam timestop, however, he is somewhat overconfident against weaker opponent and won't use timestop as he belived he can defeat them through sheer strength alone. This happened when he were fighting against
Kuroto Da and the Rider Players.
So it is safe to say that there is a chance Cronus won't use timestop as his leading moves, especially if you considering that he is fighting a normal-looking teenager boy.