Her innate potential wasn't completely achieved by Rebels though, I don't think. I mean, she was only 32 when she fought Maul and Vader. Imagine her in 10-15 years.
DMB raised an interesting point to me though, that Ahsoka staying with the Jedi possibly would have constricted her rather than make her flourish. Ahsoka going on her own path could have been a better thing in regards to developing her skills.