Whether the decision handed down in Maths v United States, 136 S.Ct. 2243 (2016) is retroactive in a post-conviction petition, as some courts have stated and creating a split Amoungst the circuits?

Whether the predated Controlled Substance Act misdemeanor convictions could be used to enhance Clark to a life sentence with the predated Controlled Substance Act provisions of 21 USC §851?

Whether the decision handed down in Mathis v United States, 136 S.Ct. 2243 (2016) is retroactive in a post-conviction petition, as some courts have stated and creating a split amongst the circuits?