Yeah talking to Everton fans in the past it seems OK that players go from Liverpool to Everton, but not the other way.I don't see what the issue is with the move over. Players (Ablett and Beardsley) have moved across the lines before after being successful at one club and still be successful at the other! That rivalry probably accepts it more than most to be honest.
They were mortified when Barmby ended up there. First time in 40 years it had happened I think?