Nikopol

Much is being made of the fact that the beginner has stated he wants to aim for becoming a Shihan.
If one was not yet a Shihan himself it would be somewhat precocious to suggest it impossible. If one were very close to Shihan rank he could explain what is involved.
If one were already a Shihan he could give a good belly laugh, and then say, by all means, but one step at a time.

And then you go to shake the newcomer's hand and he drops to one knee and throws you across the dojo with a Shihokuzushi... Muhahahaha! I am actually Yoda Zatoichi Shihan, and I was just testing you!!! Your advice was good but you are not a Shihan yet...