Issue solved.
To actually add to the conversation, I agree that the weapon must be specified. Just as any model has to be given a specific heavy weapon (heavy bolter, lascannon, missile launcher) as an example, you can't just say "my longfangs have a heavy weapon which means I pick which one before the game starts."
No you have to give specific weapons. With new rules on power weapons, they must be specified as there is in fact a difference between them. TOs should be smart enough to make people have set lists.
Personally I give people the option to have all weapons in their entire army count as base power swords or WYSIWYG. I play WYSIWYG but as the rules changed with little notice given, I'm willing to give people the option...atleast for a few months.