Good guilds are not even going to be stacking dks not to the levels of sham in tbc even.
Dks in a “optimal” comp you only want 3 or 4 any more your slowing down your raid progress with gear stacking to much while your to heavy on melee for the fights that punish melee stacking and there is a few while there is no reason to have more than that. While there is no significant gain vs the top range to bring more dks.
Of those 3-4 one is a tank to boot so it’s really 2-3 dps dks. And when I give that range it’s really 2 3 would be if you can’t find another good range dps as you would pref to have an additional range over an additional melee in the slot for most tiers.
The request itself is just dense and a obv troll thou as guilds don’t have just a single raid team many have more than 3 raid teams so trying to say people should not even have enough dk slots accross a guild to have 1 dk per raid is dense at a level that you reached crash test dummy territory. Esp right after blizzard made a post about preserving player choice.