Realization
Khan's offer was a gamble.
On the one hand, hosting classes with esteemed experts would add value to Khan's knowledge. He would have pillars of the scientific community vouching for him as long as he convinced them of his expertise. Khan could become a prominent name in the field if everything went well.
Moreover, experts deeply rooted in human fields would have a harsher time detaching themselves from their knowledge and accepting alien arts, in theory, at least. Khan's lessons might lead to nothing, preserving his monopoly over his expertise and halting any attempt to understand his power.
However, the opposite was also possible. The experts might disregard and insult Khan's techniques, denigrating his knowledge to keep the current fields relevant. Khan's achievements would contradict that, but the approach would be a good way to force him to share more.