Okay, they are only theories. Personally I wouldn’t use Punnet’s square for anything other than dominant and recessive allele. Not co-dominant or linked genes as they challenge Mendel’s law.
Back to @invisible’s question.
With your theory you will get a 1:1 THC/CBD ratio; 1:2:1 ratio of offspring. Not all offspring will be 1:1 and a test kit will be required to find the ones that are.