My opinion, Alec was in the creative process with his instrument, but it was not always in tune with what Jon or the producer needed. Hugh here to remake tracks.
I think there is something of Alec on each album, and may be the reason still give credit. I think Hugh made them raise the level of their songs, but the work of Alec, somehow, albeit to a lesser extent, is on the recording or part of the process.
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