The OP_RETURN based token schemes are as decentralized as needed / possible.
With every scheme that has been proposed, the issuer can always ignore the tokens later on. If IBM issued IBM-Tokens on the BCH-chain representing a stock of their company you are bound to either the laws or IBM's reputation that the token actually represents something. That doesn't change with using GROUP or whatever "onchain" solution.
Tokens must have a fixed / known (and observable) issuance and should be transferable without any 3rd party. That is possible with the proposed OP_RETURN schemes.
Anything else is onchain-fetishism imho. But I do not accuse anybody here of being ill-willed. And I could live with either solution. But I hope and guess, that the issue is over after on of the OP_RETURN based schemes gains traction. And everybody will be happy afterwards.
And I think both the token stuff and the preconsensus stuff is blown out of proportion by trolls and enemies of BCH. Not in this forum and not the "well known" people, I can understand that people have different views, but on reddit I suspect a campaign to stir up some trouble.