Question about Arms Micron Megatron

I actually have 2 questions but my big question is of course regarding AM Megs. If Takara chose Voyager Prime for Arms Micron why didn't they chose Voyager Megs over Deluxe? It makes all the sense in the world for Takara to have used Voyager Megs instead...right? If this question has already been kicked around my apologies for missing it.
My second question is regarding Arms Micron assembly. No doubt that a lot of you Gundam fans that are TF fans that picked up any AM figs see zero concerns with assembly. But with parts removal from the sprue's does it involve some simple twisting and pulling or would I require an exacto knife and then some? Thanks all for your input and help!
My second question is regarding Arms Micron assembly. No doubt that a lot of you Gundam fans that are TF fans that picked up any AM figs see zero concerns with assembly. But with parts removal from the sprue's does it involve some simple twisting and pulling or would I require an exacto knife and then some? Thanks all for your input and help!
