How can Mahavira return if he was in a state of moksha, from which there is no return?

According to Osho, “no return” applies only after one actually enters moksha; before that is a prior state of complete freedom where entry is possible but optional. From this threshold, a liberated being may choose one final birth, using the remaining momentum, to share the realized truth. Mahavira’s return is this compassionate pause—hence Tirthankara, a ford-maker for others.