I'm 90% agreeing with you, not least because both Lewis and Lennon early in the relationship thought they'd pay their beloved the ultimate compliment of telling her she's just like a bloke, and got a robust reply from Joy and Yoko respectively. And because Lewis was way more into verbal sparring. The remaining 10% are because of Lewis' writing and publishing with such seeming ease seems to have been an issue with Tolkien, and that in this particular regard makes Tolkien the Lennon and Lewis the McCartney. But the matches are ever going to be imperfect anyway, given the vastly different life experiences that formed them (including WWI for both Tolkien and Lewis), and the completely different attitude to discipline and work, so...