Going by DBNA, I dont think weve seen Gogeta's maximum. Its been implied Goku and Vegeta will achieve SSJ5 so..anything can happen.
Yes of course Goku and Vegeta (and Gogeta) have not yet reaches their maximum! I can't wait to see what we reserve Malik for DBNA 
Indeed, im currently looking for a good artist myself to draw my own fan series.
Now today we all know Beerus would destroy Rigor quickly
Beerus >>>>>>> SSBlue Kaioken x10 >>>> SSBlue >>> Gogeta SSJ4/Rigor SSJ5
Beerus >>>>>>> SSBlue Kaioken x10 >>>> SSBlue >>> Gogeta SSJ4/Rigor SSJ5
tell me more about your scenario I might be interested