Richard and Robin are the 2 major guitar players of the band.
Bumblefoot is just an additional guitar player, as Buckethead was, and he is not necessary to this band.
They don't need 3 guitar players.
To sum-up: nice guy...but not necessary.
I feel bad when he is justing standing around...Buckethead was a great player but he used to stand around for the most part
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