It really isn’t reasonable to expect us to influence decisions as to how you spend your money where the facts are not clear cut, and the perspective of other parties photographs is notoriously unreliable when making size or thickness estimations. Some you will get right and some wrong simply because the image does not reflect reality, but it has to be up to you whether to take the plunge. It’s great to hear of a successful rare find or new discovery when it is definite and in the hand and when correct weights and measurements and clear photos can be taken, but we don’t need to be party to your thought processes before the actual facts can be ascertained. And please don’t be so quick to take offence when it is largely not intended, which is in itself offensive and unhelpful.
The sources you quote are excellent, and with the addition of Gouby are exactly my primary sources. You are clearly a quick learner, but experience can only be gained over time , often by trial and error which is where you are at now.
Jerry