Aren't all these things when actually forming a band surrounded by too much hype and myths? The band hasn't really formed yet and everyones ideas of how and who to play with is all on anyones wall. How many guitarists haven't we heard of being thought of replacing Brian Jones in the Stones, and so too after Mick Taylor left? There's Jeff Beck, Roy Buchanan, and numerous more that was "considered" by both Keef and Mick, but they ended up doing this or that or miss auditions. Future members and considerations were all over the place if you'd like. One can't verify or deny anything of these claims anyway. Who auditoned for this or that.
We can only know of what's been stated by their own interviews. Both
Elton John and
Bryan Ferry was considered too to join
King Crimson,

after Greg Lake left. Can anyone imagine this... Elton John in King Crimson? Of course, way way before anyone of them got themselves a name. "You Never Know"!