A good comparison!

I would love to read some open research. Unfortunately there are no scientific blockchain designers in the steem-ecosystem (I´m aware of, maybe there are?). I mean I wish them the best luck with trying things out but the big guys @ bitcoin and ethereum, cosmos, ... work with mathematical proofs. On steem it was like "hey look at us we have lots of SP hence our opinion is "right"..." , I mean they maintained the code and stuff which is great but there was no opensource-evidence based discussion going on.

They just need to prove collusion resistance with a game-theoretical model...

I mean dPOS is a consensus mechanism, the voting mechanism is not the consensus mechanism. Mathematically both are two distinct modules interacting. Like PoS is not a consensus mechanism. Proof-of-Stake schemes (like Proof-of-Work) are oracles, they don´t output consensus.