Mercenaries - Scaling

Hello. As the title implies, I would like to sort out at least some of the scaling/stats that affect mercenaries. I tried to use the forum search for a similar request but doesn't seem like it's there.
My question is: does increased Spell Damage affect mercs with skills that are usually benefiting from this? like Kinetic Blast/Kinetic Bolt/Flame Wall?

For example, Rathpith Globe on poe wiki does explicitly say that it doesn't work on mercs, since it says "per PLAYER".

I have concluded a test consisting of:
Map/boss: Polaric Invitation, no mods.
Ralakesh's Impatience (for max power charges constantly) + Void Battery + Malachai's Loop, then I removed Ralakesh's which also removed power charges and Spell Damage, but the difference in damage is not apparent.
I have also tested out different variations in between, and Crown of Eyes, and Auxium, these two seem to give damage, however it is unclear. If possible, I would hope for a clear response from GGG.