Why not have JR-D as Gloin and give him some of Balin's bits. (After all, in PJ's movies he did quite a bit of switching speakers-beginning with the prologue). Some of Balin that could be transferred to Gloin:
Quote:
(Wikipedia) Among the dwarves in The Hobbit, Balin was the second-eldest Dwarf on the quest (behind Thorin), and so he spoke for the party when they were captured by the Elvenking.
He is described as "always their look-out man": He spots Bilbo approaching the Green Dragon Inn at Bywater, he spots the trolls' fire, and he's the first to spot the Elves in Mirkwood. Naturally he could not notice Bilbo (hidden by wearing the One Ring) as look-out for the company after escaping the goblins in the Misty Mountains. After this bit of trickery, Balin gained respect for Bilbo's abilities. He's the only Dwarf that volunteers to accompany Bilbo down the secret passage to Smaug. Of all the Dwarves in the quest, he is the only one known to have visited Bilbo afterwards at Bag End.
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You could certainly explain the family resemblance of Gloin to Gimli.