Yeah plus dbo isn't cannon and also 25% Saiyan is enough I think if not then that is BS
That's GT logic, plus, DBO is still canon, like, 1000 times more canon than GT, I don't know what are you talking about, unless Akira Toriyama says otherwise, or he kills someone important like Buu forever in Super or something like that.
Yup they can fly but after intense training unless you are freaking goku but.. He is a Saiyan
I'm pretty sure he did intense training in Kami-sama's temple xD