Amazing last page. Junpei has always seen himself as the antithesis to Ruo, a true polar opposite. However, to be a pro means to be able to take up any sort of role.
Blanco probably noticed this while going over Junpei's recordings, that he had a hole that needs patching and this is the opportunity. And, of course, that dance definitely sounds like the better fit for this setting.
Blanco is going to be a brutal coach, Junpei's fantasies are about to be shattered hard.