CTs are, for a lack of a better word, fractional interest in sub bonds. Because the sub bonds are in Class 10, then CTs, having an interest in those bonds, are Class 10.
I can assure you that CTs are not part of Class 12.
If you understand the structure of Caps and holding co., then it is more clear. I just don't have the energy to go though a detailed explanation because what I post goes over their head and pretty much is dismissed up until they realized what I actually said a long time ago.
(not directed at anyone in particular, just a general statement.)
imo