You do realize your completions do not go down if you delete characters right? I've deleted 3 and they never went down. Total completions count anytime you kill Atheon or Crota even if you ONLY do that fight. I've already tested that as well. None of your arguments are valid. Nothing you said impacts your completions. Nothing you said makes them decrease. Anytime you kill the final boss even if you only do that checkpoint you will receive a completion. Unless of course you only run raids just to never finish them