Grodney was right. Without 3.5B, drinking would be legal for caddies.
3.5C says: C.Players choosing to use a caddie will be solely responsible for their caddie's conduct from the two minute warning until the players cards are turned in. Misconduct by a caddie may subject both the player and caddie to disqualification and/or suspension.
No where in this statement does it declare alcohol to be an infraction, ONLY the conduct of the caddie. Conduct can be illegal with and without alcohol.
Corwin-Brown was wrong in that it was explicitly outlawed by 3.5C itself. 3.5B is required to arrive at this conclusion. It was JC17393 who first made this connection, many posts after the OP.
Thus, no panties were ever in "a wad", but nice assumption.