Folks,
The lack of any action (even guesting on album or live,like Plant & Page used to do for each other - has ceased.But that has absolutely nothing to do with Roberts vocal abilities. It's purely down to relationships (or sadly the lack of them now). When relationships (say just between Jimmy & Robert) were good,you'd have for example Jimmy coming on for encore at the Hammersmith Odeon on Robert's Now & Zen tour (I was there),with Robert repaying the gesture like on 'The only One' on Jimmy's 'Outrider'. Sadly whilst they obviously have to communicate (all three) for LZ business stuff,the cameraderie & rapport ain't there anymore. That's what Robert needs - and his SSS buddies fulfill that role for him '(a gang').
Personally,I'd like to see either Jimmy or Robert do a few select acoustic shows with Roy Harper - now that would be great.