The only thing odd in the above appears to be step 7, which doesn't fit in very well with the usual process. The exception would be if they decided to split off EC261 from the rest of the claim but even that looks odd to me. I would either call Customer Relations during UK office hours, or ping a DM via Twitter, alternatively leave it another week if you're currently pressed for time.

In a way the speed of the other refunds is curious: in usual circumstances it takes a good month or so to get EC261 (bit less for BAEC status cardholders) and they must have a mountain of claims at the moment.