Quote Originally Posted by Charybdis View Post
they are receiving Spell Speed benefit maybe it's not damage at all, but an actual recast reduction on their abilities.
As stated earlier, Spell Speed does affect the cast/recast of the pets, it's just not displayed in the tooltip. It's a bit harder to perceive on their primary attacks due to the 3s recast, but it's very apparent on the recast of things such as Aerial Slash or Crimson Cyclone.