Hrm, we have gone off topic...
Anyway, I think there is a god chance of a promotion blockage. I'll try and explain.
Most SNCO's now (I would say) got their third between say 16 to 20 years in, most will stay in for LOS 30. Look at the Cpl's now, they seem to get promoted after say 6 to 10 years, they sign on to 22. For them to get to SNCO there needs to be a place. If that place doesn't materialise then they will be a Cpl for a long time, this will stop future SAC's from getting their tapes.
This pattern could carry over to SNCO's too, as the high-fliers like yourself have to wait for a CT slot, the Cpl's behind will get held up exacerbating the problem.
Make sense? Essentially, there's going to be a blockage because of young CCpl's signing on for 22 and not making the grade for SNCO, let's face it, not every Cpl will get to Sgt.