So grogu made his choice but he is still a super powerful force user.

My thought is Ezra is gonna come back in the ashoka show and Ezra is gonna be the one to train grogu.

Why?

Because he is one of the only "masters" who has had training and seen attachments. He knows that you can have attachments as long as you cut ur self from making choices that could harm others like kanan did before he died he knew he couldn't save hera with his attachments so he made Ezra plan how to make the save

Not only that he has attachments to mandalorian life via Sabian who also held the dark Saber.

If he doesn't train grogu he will probably train kanans son that he had with hera