Who should follow Mertens and Tadic and become a 9?

Been thinking for a while Ross Barkley would be good as a 9 with his athleticism, good finishing with both feet and general cluelessness in midfield.

Firmino's effectiveness suggests a high-pressing 10 or winger who can drop deep might also be a good candidate for a switch, like Maddison.

Fekir's career also seems at odds and he has the strength.