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The real question to ask is not what should we do with a second rhythm player, but why do we need one in the first place? Django's rationale for this was that he wanted to have a solid rhythm to solo from -- plus he wanted a job for his brother and someone to carry his guitar case.
We've found in our band that having three guitarists makes for a really powerful rhythm section, even if one of them is soloing. It's a more satisfying sound than having just one at times (unless that one's name happens to be Nous'che or Hono). If you play for any dances, the more solid rhythm is a big advantage - dancers are used to keying on the drums, which are absent in a GJ band.
"It's a great feeling to be dealing with material which is better than yourself, that you know you can never live up to."
-- Orson Welles