According to Osho, keval-jnana (perfect knowing) does not automatically flower into perfect expression. Realization is solitary; expression engages the other's language, experience, and countless personality types. Hence many attain keval-jnana, but very few become Tirthankaras—those who can transmit it to all beings. Expression demands further sadhana, sensitivity, and disciplined communication; without this, a knower may remain inarticulate.
Knowing everything inside doesn’t mean you can explain it to everyone; teaching needs extra practice and care.