Ali, Bess, Leach, none of them will ever be considered world class like Swann, Vetori, Lyon or even Panesar (for a time anyway). They are all stop gaps until we find the right one.
I'm not sure if they will turn to Rashid at some point this series (not for me in tests) or if they will fast track Virdi as some want, but the day night test looks really important now as we might atleast get a bit more joy from the quicks.