Kanan Jarrus' lightsaber reveal defied the Empire's and Obi-Wan's beliefs about the Jedi's next prophesied hero. After Palpatine's Order 66 purge destroyed the Jedi Order, the Empire continued the hunt for remaining Jedi survivors in the galaxy. While Jedi like Obi-Wan Kenobi chose to conceal their Jedi identities, not every survivor followed the same mentality.
Source：https://www.cbr.com/kanan-jarrus-disproves-obi-wan-kenobi-star-wars-rebels/
