So ...:
1) you assume that if Guardian became a viable DPS then for some reason they would not use their CC skills
2) for some reason you have got into your mind there needs to be a primary DPS (which needs to be Templar, of course)
3) you say Guardian is not a DPS, meaning you suggest all of their damage buffs are for the sole purpose of making Blue Drain stronger, and you nullify all of their pure damage skills
Sorry but you make yourself look like you have your head in a place from where you can't see clearly.