This entire thread is not a "debunk" that Marines+Shichibukai=1 Yonko. In fact, all your points are much more easily and more coherently explained by simply saying that Marines+Shichibukai=>1 Yonko.
For example, your Influence part is just saying that the Marines are afraid of the influence of Yonkos, and you attempt to use this logic to somehow debunk that Yonkos are stronger than Admirals. But you do realize that this would still make sense if the Yonkos are just straight up stronger than the Marines, right? In fact, it makes even more sense that way. It makes little to no sense if 1 Yonko is just a tiny piece of power that they can easily get rid of, but just don't for plot convenience reasons that you've been advocating for.
The Resources part is also more easily explained by 1 Yonko=<Marines+Shichibukai. Obviously, resources play a big role. However, the Marines' fears are more easily explained by the idea that they cannot handle more than 1 Yonko. Obviously, they do not want to lose resources, but it makes more sense if the amount of resources they would lose is so much that they would rather not fight any of the Yonko IF Yonkos are around as strong as they are individually.
The Timing stuff you mentioned is the most irrelevant BS I have ever seen. Neither Big Mom nor Kaido acknowledge the Marines as threats. Yet you take statements from Marines themselves saying that two Yonkos combining just happened at the worst possible time and somehow took that to mean that Kaido and Big Mom are afraid of the Marines. It's one thing if they said something like "Thankfully, the Marines are occupied." but they never even imply that. They didn't even read the newspapers that said they abolished the Shichibukai until AFTER Big Mom started going to Wano. So that Timing point is complete and utter BS. What the Marines are saying is that two Yonkos combining is a hard thing to deal with if they can deal with it at all, and on top of that, the Marines have another nuisance in their hands, to take out the Shichibukai, which made the already annoying problem of the Yonkos combining even more annoying.
Your stuff about Kaido somehow saying Yonko=Shichibukai+Marines is just complete nonsense. It's just him saying "The Marines are no longer the strongest individual force of the seas, so each Yonko can take over the WG" or something of the sort.
The part where you state that Yonkos not being together is irrelevant is irrelevant. The fact that they're not united means they're superpowers each on their own. Garp's statement is simply saying the WG is the most powerful of the superpowers, and they established the Shichibukai AND Marines so that it stays as the most powerful superpower. It is saying that the WG is stronger than ANY individual superpower, meaning it is stronger than EACH of the Yonko, not all of them combined. In fact, the fact that they're not together means that no single Yonko wants to fight any other or weaken their forces because it directly leaves them vulnerable to the other two, to the point that they could be wiped out. It's not the WG itself holding balance against all 4 Yonko by itself, it is each Yonko stalemating the others, and the WG being the 5th party in that stalemate. If what you're saying is true and Marines are stronger than all of them combined, the fear of loss of resources from dealing with 1 or 2 Yonko is nowhere near enough fear the WG gives them. We've already seen that Kaido, Big Mom, Whitebeard, and even Shanks are willing to use resources for a good enough cause, or even no good cause at all. Kaido and Big Mom would rather not fight, but they will if they piss each other off. Shanks was willing to fight the Marines if they didn't end the war. Whitebeard literally sacrificed his entire crew for Ace. They don't care about resources as much as you are saying. Even the Marines themselves send forces to take down Shichibukai, and if them never wanting to lose resources was true, they would have just let the Shichibukai, who have helped them for years, just roam around without actually engaging them, especially Mihawk, who is the reason Shanks is a Yonko.
tl:dr your post and points are much more easily explained by saying 1 Yonko is almost equal to, but slightly weaker than Shichibukai+Marines.