I basically agree with you. However, the above quote from Steve Turner's book is a recollection from British dj Jimmy Savile who claims to have been present the day Paul was inspired to write "Paperback Writer." Since he's giving an eyewitness account, either Savile's recollections were mistaken or John and Paul had a discussion in Saville's presence related to John giving Paul the responsibility to write the next hit. When Paul came into the studio shortly afterward proclaiming, "Gather 'round lads, and listen to our next single," this could easily have been the results of the earlier decision that Paul would write the next hit. Another case in point is that, although "djs and the buying public 'chose' we can work it out as the leading side" as you stated, this was primarily the result in the US, not Britain. In John and Paul's minds, "Day Tripper" may have been the primary track from the previous "double a-side" single. One can point to them continuing to perform "Day Tripper" live throughout the remainder of their concert career, not "We Can Work It Out." The "dominance" you mention is something that we all can look back on retrospectively and accept as true. How they viewed it in early 1966 may very well have been quite another story. So, basically I agree with you but, in order to be complete, I needed to include this interesting eyewitness account. Thanks for your input.