If his attack is real (and he may be bluffing) and XMR doesn't recover (i.e. he can't gain by buying it cheap), then we can surmise his contribution is "forced evolution". Consider an alternative meaning, wherein the evolution involves teaching the community not to be sheep. Afaik, BCX is apparently involved in "operation shitcoin cleanout". Apparently many people complained to him that XMR is a shitcoin. Apparently he claims he found some vulnerabilities, but he didn't particularly feel motivated to attack XMR, possibly meaning he didn't feel it was a shitcoin. But perhaps his appraisal was near to some threshold and some events pushed him over the edge and he decided to force the XMR community to prove it is worthy or insolent. Just one possible theory for the chain of events.

It could also be that Moneroman88 pushed him into a corner to defend his reputation. Then when I published the idea about private keys, he decided to issue a deadline. So perhaps that was the event that forced him to put pressure on the developers to hunt down an alleged problem.

Edit: again I am not alleging any proof that there is an attack. I am still analyzing and trying to determine if there is any evidence of abnormalities.