Et Nos Credidimus Caritati

When the Society of Saint Pius X ordained its new bishops, then will it just miss out the bit that asked by what authority those men were being ordained? In fact, who has chosen them, and by what means? 

The SSPX believes Robert Prevost to be Pope Leo XIV, and thus believes him to be a bishop, validly ordained in the Modern Roman Rite. As part of the Latin Church, why would it need its own bishops?

And Pope Francis granted the SSPX faculties to hear Confessions. In principle, would they welcome other priests to do so for their congregants? If so, then there is no state of necessity for these ordinations. If not, then the SSPX is already in schism.