Shanks IS part of the band in the studio - now he needs to complete his job on stage - I think it would be a lot better to have the musician who made the songs perform on stage - it is more logic to me, then the band would be a band.
I can't believe I am writing this but - honestly - to have just Jon involved in the creation process on stage is a problem for a BAND (unless Dave writes and works for Bon Jovi next time but so far BB is Dave less)

I vote yes not because I love Shanks but because Shanks would complete the process as a band

(I have no clue if he is a good guitarist live but at least he would perform his songs)