Conversation so far:
What happened to Wishbone Ash in 1981?
Turner was replaced by bassist and vocalist John Wetton, formerly of Family, King Crimson, Roxy Music, Uriah Heep and U.K. Number the Brave was released in April 1981.
Did John Wetton leave Wishbone Ash after that?
Wetton did not continue with Wishbone Ash beyond the album sessions and instead co-founded Asia.

Question: Was there a reason given for why he left the band?
Self-contained rewrite: Was there a reason given for why John Wetton left Wishbone Ash?