Heero Yuy said:
The term Padawan doesn't even make sense. Kanan himself was barely a Padawan himself when the purge went down. It's as I said, a noob leading a noob.
Where has it been established that Kanan was a Padawan during the purge?
Also keep in mind the character who is calling him that doesn't know the characters, he's just seen a Jedi and what appears to be his apprentice so obviously he's going to call him a Padawan.