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Also.... none of those champs are going to be worth your time. The damage multipliers matter little when base stats are so low. Preservers best use is as a fusable champ to help you get Rhazin, a champ who is well worth your time. :)

Easy way to compare the damage of that heroes with the well known damage dealers: do, waht the game does to calculate the damage, multiplicate their atk with the coefficient.

Dervish: 8.6 x 1112 = 9563.2

Well known single target damage dealer like Excruciator: 5.2 x 1597 = 8304.4. Increased by 35% from veil (what she gives herself from her passive) = 11210.94. You could add an additional 20% from books, while Dervish books on the A2 will only increase the debuff chance for the useless small heal reduction. Then Excruciator starts with a 10 points higher crit dam. In the end, Excruciator does not only deal more damage, she also has better extra stuff on her A2.

I think Dervish is not worth building, and so are the other champs you mentioned.

/edit:

Knight-Errant 7 x 1387 = 9706. Increased by 75%, when attacking with full hp, what is easy to obtain, just go first = 16990.75.

And maybe you are also interested in this thread I started a while ago.

Thanks for the advice.   Am I mistakened? I thought coefficient is on all attack, with gear too.  That's why I was having trouble getting a comparison

You're not mistaken. The problem is that the multiplier is only part of the equation.

Simplistically, suppose we use your example of Preserver. Her A1 has an 11x ATK multiplier. However, her base ATK is only 771. Also, assume she has her A1 fully booked, giving her an additional 10% more damage. Again, simplistically, that gives her 11 * 771 * 1.1 = 9329.1.

Now, compare that with someone Candraphon, a more traditionally renowned A1 smacker. His A1 is "only" 6x ATK (assuming the enemy has a buff). However, he has a base ATK of 1509, and his A1, fully booked, has an additional 30% damage. That gives him 6 * 1509 * 1.3 = 11770.2, which is 26% more damage than Preserver gives.

Ontop of that, because his base ATK is significantly higher, his ATK% items give much more bang for their buck. Suppose we use an item like an ATK% chest, giving 60% more ATK. For Preserver, that yields 771 * 0.6 = 462.6 bonus ATK. For Candy, it's 1509 * 0.6 = 905.4 bonus ATK, which is almost double what Preserver gets.

Consider that most people will have a *lot* of ATK% bonus on their items - 60% from chest, and usually another 100% from substats and glyphs. That adds up to a major differentiator.

I was fearing as much, as I dont have any 6 star gear yet, dont know the end numbers.  That does make sense though as preserver is simply a rare.  Would you happen to know the top end of flat attack?  like +1000 from gear or something?  And then can compare with ATK% and a high atk champ

Here's an example of one of my better-geared champs. By no means is this top-end, but it should serve as a reasonable proxy. Of the +4060 I'm getting from artifacts, 265 apiece comes from the main stat on the weapon and the main stat on the ring, 64 comes from a bad chestpiece that needs replacing, and 58 comes from an amulet. The remaining 3408 is from ATK% primary and substats.

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thanks that's actually really helpful

The coefficient takes all attack into account, including gear. But as the gear is different at every account, it's much easier to calculate without it. That way you get a kind of base damage for the champs. The end damage is individual for everybody, according to their gear. But the base damage (attack or other damage stat x damage multiplier) is allways the same. Calculating this base damage without gear allready shows you, wich champ will be worth to get the best gear. 

Let's take the champs from my exampel above again, Dervish and Excruciator, both now with all bonus attack aviable, gear, great hall, arena, let's say +200%. 

Dervish: 8.6 x (1112 + 200%) = 28689.6

Excruciator 5.2 x (1597 + 200%) = 24913.2 +35% = 33632.82