The match was postponed only due to rain, if there was any chance this match would have been played. But if this match was started at that time, there was definitely a possibility of Kolkata Knight Riders team winning. But the Gujarat Details team has no chance to enter the qualifiers as they have only five match wins.
The match was not postponed, but cancelled (or abandoned). There are no reserve days in this season of the IPL. So if a match gets washed out, the teams will be sharing the points. Anyway, even before the match started there was hardly any chance that Gujarat Titans would have qualified for the playoffs. They were near rock bottom, with just 8 points. Their experimentation with Afghan overseas players failed miserably this time. And at the same time, they ignored talented players such as Josh Little for team selection.
If you are referring to Josh Little not playing in last game despite having taken 4 wickets in earlier game, it was because GT wanted to replace Saha with Wade, since 4 foreign players are allowed they needed to take measures and had to sit Josh Little out; yes, they could have benched Noor Ahmad for Little as well but GT is infatuated with Afghan players, they they rarely sit 'em out.
Had Robin Minz was available, GT would be having dometic wk replacement for Saha but it wasn't the case.
Honestly, Sai Kishor is as good as Noor Ahmad if not better, adding Ahmad in XI was waste of foreign slot.