Francesco has a mezza voce, which might, by a stretch of politeness, be called baritone.
While studying an application he sang, mezza voce, the aria from Pagliacci.
So remember in a mezza voce to see that the register is right and to use a double breath strength.
I myself have been blessed with what is called a naturally placed voice, and never had trouble with the mezza voce.
Take her mezza voce and her phrasing in the second act of Monna Vanna, take them and bow down before them.