I also think that Ali s unit is overpowered. I mean Even if both the other pilots weren't too skilled he was still up against two enimies at once actually I wondered that he retreated after being confronted with 4 Gundams because I thought he would have had the possibility to go against all four of them. Not to mention that its unit doesn't even have a full normal gn drive. It is just a fake one. And also: Setsuna's skills have greatly improved from his beginning skills but here I think he will even improve further during this season not to mention that their possible skills should also have been a reason for becoming meisters.
However I also think that Aeolia s plan is not completely known to Ribbons, after all why would he then entrust the twin-drive and real GN drives only to the meisters.