This is general problem of minions that are not controled by players.
Our demons suffer from AI delay in combat.
look at my dreadstalkers, after their jump.
And all warlock non controlable demons do not share main pet commands like attack, follow ETC.
Here my non main demons don’t change target while me and my main demon has changed target to new one.
While DK’s ghouls use same target mechanics as main ghoul, so DK can easily manage his army during fights.