2) Later people reconnect and sign is the problem. It's usually (not always) not later, it's then and there. a->b->c tend to happen in somewhat real time.
A is the input registration phase, B is the output registration phase, and C is the signing of the complete transaction. Phase A always ends before phase B, which always ends before phase 3. Where's the problem?
So now I know what to look for. And with blocks being full with ordinals at the moment you can probably eliminate 80+% of the TX, take out what are other known addresses and transactions. And the few dozen or hundred at the most can be sorted through at the governments leisure.
-Dave
Ordinals has absolutely nothing to do with coinjoins.