Nope nope nope and nope.
But it does give you good titan damage when you stack yellow
Chao does help on mana cut. Using jackal Wu and Chao can help you on all titans except yellow due to jackals special
No, Jackals defence debuffs doesnt stack.
with itself.
But having 2 provides some redundancy in case one Jackal is wasted.
Jackal also has a high attack, which is good if you stack yellows.
The debuff doesn’t stack with jackal but if you fire two jackals at a target it takes more damage the second time because of the debuff. Since the special mentions a color it’s a coloured special compared to Caedmon who’s special is considered colourless.
Gretel is pretty useful on titans if you time her special right. Getting rid of that titan special animation effect saves a lot of precious time. I am also a fan of Chao, fast mana is useful and he’s pretty tough. Great for war or raids.