Knowledge Pets works only for Eleon "Chance" Knowledege gain
Tests in Hadum showed that they had impact for neither Monsters not Structures:
First row of targets was killed equal number of times with the Second row (pairs for Structures and Monsters), while Second row had at least 14.65% bonus of knowledge gain from pets. Result knowledge for both targets in both pairs ended up to be similar (knowledge with 14.65% bonus had to be as big as green line)
For Bosses they give zero bonus too:
Aligned knowledge from 2 similar runs with different knowledge boost (36% and 7%) have the same knowledge gain
With such a difference they should look approximately like red theoretcally boosted lines.
I have a different experience with pets, you are giving misleading data ?!
1. Pets Set (Attack, Attack, Defense)
Pet Bonus: +180 CP
2nd Pets Set (Silver Drop, Silver Drop, Silver Drop)
Pet Bonus: +90.33%
3rd Pets Set (Damage Bosses, Damage Bosses, Damage Bosses)
Pet Bonus: Damage Bosses +31%, Damage World Bosses +9.9%
There's no reason not to trust the developers and the in-game data, it seems redundant to me to run pointless tests when I don't know all the parameters.
Boss Rush - with 3rd Pets Set (Damage Bosses), the fights were much easier (the difference is noticeable in critical parameters)
JAACO vs GAVELLE
JAACO = 30416 CP vs Gravelle = 46000 CP (suggested CP)