well, he fell out with Purdy (I don't know why, I don't own a copy of the Bukowski/ Purdy letters), and he forgot about Layton. I do know that Purdy turned him on to Layton.
being Canadian, I've read a lot of these two writers...Purdy was closer in spirit to Buk, and he wrote about the same things fairly often.
Layton was a larger than life character, loved life, women, talking and being the centre of attention. kind of a Canadian Dylan Thomas, but with a longer life span. the media loved him, he was spirited and engaging and long winded.
but , to steal a phrase from Buk, when they were on, they were very good, both of them.