What do you mean left the chain open for attack? Are you referring to the recent double spend attempt which went absolutely nowhere? If you were really concerned, it seems like you would've taken your business elsewhere by now.
Beware of BSV 'promoters' who spend every waking moment on Twitter and haven't logged into Twetch since April. At least the FUDsters on Twetch are participating in the BSV ecosystem.
The fact that the BTC and BCH were spent, but BSV was kept is not 'proof' that Craig was the sender, but if you put everything together with the fact that Craig telegraphed his actions ahead of time, it's absurd to think this was all a coincidence.
Just to continue the conversation from earlier, it was actually well in excess of 60 million Satoshi era mining rewards that were moved last year. Craig's favorite charities are educational... AIER and FSF
What private key explanations are you skeptical about? The only claim Creg has consistently made is that keys do NOT prove ownership, which is 100% correct.
It's a fact that 2010 block rewards were moved last year and donations were made to Creg's favorite charities. BTC and BCH were liquidated, but BSV was kept. How much more obvious can it get?