So I'll grant you that the differences in the smoothness in the ethereum vs tezos charts is interesting, but your argument is still unconvincing to me for two reasons: First of all, you're basically saying "The ethereum graph is so perfectly what you'd expect from an ideal auction that it can't possibly be ideal" which is the sort of argument that requires more convincing evidence. Secondly, the Tezos auction had many differences in the auction design from the ethereum auction, which could be a more mundane reason for differences in these curves.
...also, I feel like you still need to explain more explicitly why bidders making purchases in multiple lots is a nefarious thing- Does the argument just boil down to saying there were too many big fish, which means that ethereum may not be "decentralized" and therefore a security? If allowing arbitrary people to make their own purchasing decisions on an asset is not adequately decentralized, then it seems you've defined "decentralized" to the point where no asset could ever reach your threshold to fall under that definition.
...also, I feel like you still need to explain more explicitly why bidders making purchases in multiple lots is a nefarious thing- Does the argument just boil down to saying there were too many big fish, which means that ethereum may not be "decentralized" and therefore a security? If allowing arbitrary people to make their own purchasing decisions on an asset is not adequately decentralized, then it seems you've defined "decentralized" to the point where no asset could ever reach your threshold to fall under that definition.