Agreed. The only reason that nothing changes is Jon's immense laziness.
Everett is as necessary for the overall sound on rare album cuts as Lorenza may have been and they pulled out rarities night after night in Europe 2008 - like maniacs. Phil already has played on a great variety of other BJ tracks in 2013 and had shown for a show like Cologne that he could learn the lead parts of numerous songs in literally no time and pull them off in a great way. And for Shanks being new - firstly, he'd only have to do rhythm work and secondly it'd be his ****ing job to learn new material on tour if the CEO demanded it. They're there for this and nothing else and they've been on tour for over two months now.
So yeah, it all boils down to Jon's laziness at the end of the day...