Just him - and he wasn't the one with the expertise developing the new features, including anon. It could be that there's currently no one developing the anon features while he's looking for someone new.

Mindfox offered to help, upon discussing terms - I tried to arrange that, but CinniCoin dev said no, despite obviously needing the help and a big-name boost for the coin.

I don't know what the heck he's doing. As far as I know, he and/or the other previous devs were among those dumping the coins all this time. It would certainly explain a lot.

Think it's time for what's left of the community to consider a fork/takeover with a new, responsive leadership and try to re-invite mindfox to take the lead.

I respect with CinniCoin did previously, but the coin is dying and he does not have what it takes to bring it back to what it was.

Time for a community takeover/fork.