Ramin Karimloo as Nicky would be a bit of a nod to Omar Sharif and the infamous Egyptian kissing a Jewish girl "controversy".
Of course as the name suggests, Nicky Arnstein was a German Jew in real life. Apart from his talent and charisma, why DID they cast Sharif? Who else was considered? What 40-ish, sexy male stars were there who would have been believable? Anthony Quinn? Burt Lancaster? Kirk Douglas?