Starting with the simple things... "Ruach" is "Wind" in Hebrew, but also is a word that reflects the human spirit. "Eschaton" means the reign of God after the end of the world basically. It was Ultima's Dealthblow in FFXII. As for "Retribution," renaming that is fine. It can be whatever, really. White Mage currently has one of the most sparce gauge systems, so there's room to comfortably add something else. And in this case it's not even really a thing to manage, just a visual placeholder for where you are in leadup to Holy III. And doing something like Ruach > Eschaton would just make it look cooler similar to Red Mage's Verholy/flare > Scorch > Resolution. And while you theoretically could just have it be empowered Glares, you could say the same about Red Mage and Jolt. Why have those burst animations if you could just raise the potency of Jolt? Sometimes the answer is simply "because it looks cool." And the DoT was just a way to spread out a very large chunk of potency. It's not that we can't have high potency nukes, and I could've split it up more between Ruach and Eschaton, but higher potency also means higher crit variance. Since you don't need to manage it, I don't see why it's a problem. Like with Circle of Scorn, you don't really need to think about it much, and the initial damage higher than Glare III anyway. But it's not super important that it's a DoT either. As long as the potency works out, I have no qualms moving numbers around.
I tried to avoid touching Assize in this example because that does mean the total potency would need to accommodate that loss of OGCD potency, and I was trying to keep the total potency per 2 minutes at 16500 from where White Mage is currently. But you could easily do that as well. It just requires more adjustment in numbers.
If you'd like, why not take your own shot at the challenge as well?
Current White Mage has the potential to deal 16500 potency per 2 minutes on the GCD. Try and keep Glare's potency at or less than 1% of that total, i.e. 165 potency or less. Try and still reach that 16500 potency with whatever else you want to add to your design. Identify how many casts of each tool you'd use per 2 minutes, how much potency that adds up to, and keep track of that to gauge what potencies other tools need to be to meet your 16500 quota. Try to avoid giving any one action too much burst potency. Like Roe and Shurrikhan were mentioning on the other page, you don't really want the healer to be a burst assassin. You don't need to use the formula of 26 casts for non-Glare spells, but I do recommend keeping your non-Glare casts in that ballpark because it will help moderate your potencies somewhat. The more you need to cast other things, the lower those potencies can afford to be. The less you cast them, the higher they need to be.
If you want to count something like Afflatus Misery, you technically could. I just didn't because Misery is technically optional. You don't have to use Afflatus heals, or cast Misery to reach 16500 potency in 2 minutes.