I have had 'Granger' units - Guides 14-18 who wanted to stay Guides, couldn't go to Rangers. So we did lots of unofficial challenge badges, lots of cooking etc. Basically it was a Ranger unit, but some of the Guides were finishing off their BP, so had to stay Guides anyway. Now I'm in a different area, and there is a Ranger unit, but none of our Guides want to go to it. And the reason you get Guides of 16 is because theyre waiting to get a BP adventure, and cant go to TSS before that.