There is no jurisdiction in which the facts of this situation would constitute a binding will.
The circumstances in which a will can be formed orally are death-bed situations where formation of a proper will are impractical.
Consideration means both sides need to give something in order for a contact to be formed. Asking "can I have x", and the other side saying "yes" is not a contract because there is no consideration. This is day 1 law school Contracts stuff.
A will requires a document and cannot be formed orally except in very specific circumstances that do not apply here.
Leonard would not be controlling here. This is a plain case of a contract lacking consideration and thus being invalid. The case would be dismissed, no need for summary judgment.
The contract lacks consideration and would not be found valid. No contract, no damages, no contingency.
