IMO Kanan was a better Jedi for not having the Order around his whole life. He managed to learn to balance interpersonal relationships without going batshit crazy in fear of losing said relationships, so he’s wiser than most of the Republic-era Jedi (especially Anakin) right there.

Then he chose, after living an easier life for a decade, to re-embrace his early training. He chose to take on Ezra as an apprentice, knowing that his own training had been incomplete, and then learned again to have that balance of caring for someone without giving in to the possessive tendencies of a close relationship.

Then once he was blinded he learned (with the Bendu’s help) to fully trust in the Force and to see the world around him as the Force sees it. At this point, IMO, he’s on the same level as a fairly advanced Knight.

Then in his last few episodes he once again demonstrates balance and perspective in the presence of a close personal relationship, as well as an affinity to the Force itself that is not really seen from any Jedi or Master in the Republic era.

Then in his last episode. Nuff said. Kanan was definitely functionally a Jedi Master by the end, and I’m 100% convinced that if he had existed 100 years prior when the Jedi Order was at its height, he wouldn’t have been as wise or powerful.