I'm questioning your logic about unit not being used isn't up, considering the fact that you have used a single example, while we had pretty much every single doctrinal unit not being used due to it being up, the only possible exception being current partisan doctrine.
There are crushingly more examples that units aren't used because they are weak or inefficient then there are examples that they are overshadowed by stock unit and emerge only after that stock unit is nerfed.
I have never claimed that doctrinal unit not being used means that is not up. I have clearly and repeatedly post that if doctrinal unit is not being used that does not automatically make it UP. There are factors that might lead a doctrinal unit not being used, other than its cost efficiency (the existence of similar but superior Commander, equally good or better stock options ans so on...)
I will have to ask the same questions again:
Was the Dhsk OP?
Was the Dhsk used?