I'm familiar with the tower you're talking about. The Jedi Council sat there. They would do most of their teaching there with the younglings. I believe they also housed the archives there, though I could be mistaken. It was the Jedi Masters mostly who all sat in the tower while those beneath them in rank would go and do their...duties.

[ Was it their duty? To help? Who knew. Leia only had a limited knowledge of such things she could share with her brother. ]

Not all of the Jedi stayed isolated, is what I'm trying to say.