If Yhwach could use The Almighty, then Yamamoto would have no chance. This is the same man who curbstomped Ichibe, so Yamamoto has no chance even at full power in Bankai. Without The Almighty, the tables turn completely. Yhwach has no chance of winning against Zanka no Tachi. The problem is that a lot of Quincies in that arc had very conceptual abilities; powers you can't quantify in mock fights like this as if they were DBZ power levels. For all we know, Jugram could've used The Balance to "balance" the difference in heat between them and basically create a makeshift version of Zanka no Tachi. He could probably beat Yamamoto too. So there's way too many factors involved to just boil it down that simply. The Almighty is a huge gamechanger.