Nah, it depends on the teacher you have and how his teacher taught. Not uncommon. There are some teachers in Japan who teach the Shinto-ryu & Uchida-ryu as a warmup in the dojo and then progress onto the Omote, chudan, etc, so that as your skills with the jo progress, so do the auxilliary weapons skills. Other teachers instruct in a different way, teaching the heiden bujutsu sometime after learning the chudan, or samidare. Case by case, mate.