I would not change anything now. It should have been done in March.
Well, that is the right decision. But in this case, the logical decision is to give CTG back his 2014 results as well. How would it look... disqualifying him after being found guilty, but only for the earlier year, not for the later. I'm saying this as the unreal 'champion' of 2014. Give the title to the one who deserved it the most. If you keep his 2015 results.
I was never good enough to be a real champion. Many 2nd and 3rd places, but nothing more. (Though a meter from me, there is the original Stunts game won at Kalpen 2003.)