JMC, the link that rreis provided seems to confirm what you've stated.
Nathan wrote:
I will still hold Welch as a firm credible source. It has nothing to do with the vile dislike others hold against CY. Just facts.

Just because CY did it first publicly doesn't mean he was the first.

Did you read the post I made earlier regarding why the recording of an event is important? Let's be clear, the belief in Welch's reasonable claim is not supported by adequate data to make it an undisputed fact - you may choose to believe it, however that is an act of
faith, not based on proofs, and not fact.
As to the first internationally recognised FAI record, IIRC a legitimate speed record has to include an averaged speed over several runs in opposing directions to negate any directional advantages. So any contender has to have made several runs on the one flight. Secondly the 'barrier' isn't recognised milestone in terms of speed records as such (partly as it's density altitude variable) so the relevant air speed records will be simply for a speed exceeding the sound barrier's zone.
Regards,