It's interesting but I just want to say this -- remember how the old Nuva were all uniformed and looked the same? Well, Lego did change that, but at least they gave back a "standard" color scheme. Gray/silver with their primary color.
Also, Kopaka doesn't have a butterknife. He has a bayonet and if I'm flying at 70-150 mph, I don't want to be dealing with carrying five things in my hands. I can fire light and ice out of one thing and I can fight hand to hand with it. Don't think a bayonet is useful? Watch a war movie and you'll see the psychological effect of it.
Oh, the color scheme is a bit wacky with Kopaka and I'll have to agree with you that they could be better.
Kopaka's fine but give him a bit more white and replace his torso and upper limb armor with silver... Lewa could do with his original colors but I could stand Metru Green and lime with silver armor. Pohatu just needs a silver breastplate and he's good to go.
~SB~