In the Res soldiers get promoted faster. The army as to keep them happy. I have seen Snr NCOs that have failed a 6A/6B and get promoted just to fill the gap. This is the problem I have when Res go on tour and keep their rank.
On my last tour, a RES Sgt from the 1st Hussars could no cut it as a Ptl commander. But they made aspot for him. Because he signed a contract. If that was a Reg Force Sgt, he would have been infront of the RSM and demoted and off tour. I know of two Reg Sgts that have endded up Cpls.
Also at the RCR leadership school, they put through a 9 month Gunner, and it was promoted to MCpl. 9 F678ing months. In the Regs most don‘t even finish their first PCF course.