Actually, this is literally a page taken out of the Jay-Z playbook.
Jay-Z took the hook for I Just Wanna Love U (Give It To Me) from Omillio when he was squatting in one of those "Philly" recording sessions. He put the stars in his eyes and gave him a video look and a handshake, but didn't break off a percentage of a huge single since he didn't have his publishing setup.
This kid shoulda learned from Omillio, set up a shell publishing with ASCAP, BMI, or SESAC first, then go to the studio session, get sampled, deliver the hook, and get his points. If you don't have rights to your art, your gonna get juxed in the industry,