Well, in arenas you barely have any time to cast due to pressure, your best bet would be to spec
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Feral isnt as good for pvp, it lacks cc and the mana resto will give you so much survavility
and for the warlock tell him to spec SL/SL
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Reason for not being destro or felguard
1. If he is specced destro he will fail, in arenas there wont be alot of time to cast ( that is why druids healing over-time effects suceed and hence reason why they are on top of all brackets, also mana effiency)
2. If he is felguard he will rely on felguard damage, but a felguard can be banished in arena (same as treeform.. watchout!)