He went back to being a guitarist in a side project/band, Fat Mattress, toward the end of his time with Hendrix.
Not exactly. As per firsthand accounts and multiple biographies, Redding arrived at an audition for a new, revamped version of The Animals, only to find that the guitar slots had been filled. Chandler, who had been bassist for the original organ-driven lineup of the band, had dropped by to check on how things were going, took the still-available Redding aside and inquired if Noel would take up bass for Chas’ new project, backing up this new, totally unknown and unproven American soul guitarist that Chandler had discovered on his final Animals US tour by way of a tip from Keith Richards’ then-girlfriend. Mitchell subsequently got the drum position by winning a coin toss with Aynsley Dunbar, who still didn’t do too badly with his career. I don’t think that any of them had an idea of how huge and influential Hendrix would become, Chandler just saw the potential. But the hair thing is what sealed the deal with Jimi. One thing that is not necessarily proven, a bit of conjecture, is that Chandler is actually heard on the first single, “Hey Joe”, having recorded over Redding’s not quite right parts.