According to Osho, limiting Tirthankaras to twenty-four is a later institutional decision made when Jainism felt it had reached its peak with Mahavira; spiritually, truth is ever-living and new Tirthankaras can arise anytime. Clinging to a fixed number turns a living process into a museum; choose the fresh awakening over settled tradition.
No—the “twenty-four only” rule is man-made; life keeps producing new awakened guides whenever we’re ready.