Johnny Starbuck was more than "just a roadie" for the Stones. By the way, the roadie job is an important task, and I think it is wrong to look at that job as someone who just handle guitars, work on stage. Some might have seen "roadie" pictures of Ian Stewart from the good old days...
There is a good article about Johnny Starbuck here:
Who is Johnny Starbuck?
[
lovecohen.com]
By reading the tour programs you may see who is in charge of the stage and all other parts of the tour organization. The person in charge of the stage as see from the guitar technicians, what I would call the stage manager, is titled "Backline Crew Chief". Royden "Chuch" Magee had that position with the Rolling Stones until he sadly was suffering a fatal heart attack during the rehearsals in Toronto Thursday evening July 18, 2002:
Chuch Magee
[
www.iorr.org]
I think Johnny Starbuck was involved in managing the backline crew and the technicians at the beginning of that tour, i.e. FORTY LICKS, then Pierre de Beauport took over the stage management postition as "Backline Crew Chief" some time during that tour, and has been in charge of the technicians i.e. the backline since then.
This is from the "Who is Johnny Starbuck" article:
"Chuch died of a heart attack during the rehearsals for the Licks Tour and Keith and Ronnie had me take Chuch’s place as Ronnie’s guitar tech. Not being a guitar player, it was quite a responsibilty for me, but I learned a lot and did the whole tour without getting myself or Ronnie into too much trouble. For the beginning of The Bigger Bang Tour I bowed out of that position telling Ronnie that he deserved a real guitar tech that knew more about guitars and amps than I did, and Pierre thought it would be a good idea to have one guy just to do the re-stringing and tuning of all the guitars… Keith’s, Ronnie’s, Mick’s and even Blondie’s. So I took that on. It’s a big job,since there are about 65 guitars on stage every day that have to be show ready.”
Bjornulf