John is that he always had an extremely dry sense of humour and rarely seemed entirely at ease in interviews, although if you see clips of him talking in the 70s he seems a lot more relaxed and easy-going.
By this time his hearing was seriously impaired and having read his biography it seems he found situations like this quite hard work and could appear a bit withdrawn.
As for his playing/tone, he always has and always will be the absolute guvnor for me. As much as I adore Chris Squire, Geddy et al, they're all standing on John's shoulders. And it should be noted, he never had the one tone, at least not until his senior years. He changed his sound quite a bit.