Here is some real life measurement of Yuzuha C2 benefit from the perspective of average player who rarely uses assist points. Both runs felt like I did get the most out of the situation, good runs.

Using only the damage score, it's a 26% DPS gain.
1. This test was done with 1-star weeping Cradle which is suboptimal for the C2 mechanism cooldown alignment with energy regen.
2. The Yuzuha C2 benefit is not set in stone! It will evolve as you get better agents with better Chain attacks.
3. For Jane in particular, the Yuzuha C2 means she can more aggressively use EX special without fearing losing the passion stream bar, each Chain attack renews passion stream.
4. All of this allows more iframes and more smooth combat.

Next up, before I upgrade Weeping Cradle, I will test the same setup, but with Burnice being the Chain Attack recipient.