Dilana is the only one I'd say for sure. Other prime suspects:
Lukas: He's certainly eye-catching, but he's still a wee lil fellow
Storm: Sure, she's beautiful & commands her performances, but she's slight, blonde & delicate looking.
Toby: He has the stature, but his performance style is weak.
Those are my only top contenders. I don't think Dave even thinks about Zayra as a contender for the job, so I'm leaving her off the list of suspects. I think she'd stick out in front of the band, but maybe not in a good way.