I think I have to agree: This isn’t quite definitive. Each answer has a margin of error:
2) Would the mask of stealth that Nidhiki wore be the same as the one Nuparu now wears, only a different colour? Could it have been a different style like Lhikan’s hau?
2) Yes
This is merely a confirmation that they have the same mask power; there aren’t two powers both referred to as “Stealth”. This cannot be taken to mean that their masks are the same shape, since Greg did not address the mutations on Nuparu’s mask. If you take “the same as the one Nuparu now wears” to mean “same shape” then that would mean that Nidhiki’s mask also has tubes, which we know is not true.
[EDIT: After reading closer, I do believe that this was intended to say that Nuparu and Nidhiki’s masks are identical. However, this came from early 2007, probably before it was confirmed that Nuparu’s mask was changed in some way. Because we know that they are not identical, so this statement cannot be true.]
2. Does Nuparu Mahri’s Kanohi look exactly like Nidhiki’s or was there some difference to them?
2) Not exactly, because Nuparu’s has tubes attached, etc.
Here, Greg says “etc.”. This means that there could be other differences.
2) Are their masks the same shape as the normal versions of these masks, with the exception of the tubes, or are they slightly modified (ie. what appears to be a breathing apparatus on the bottom of Nuparu’s mask only being on his and not on Nidhiki’s)?
2) Far as I know, they are normal shape
Here, he gives his intentionally-vague “As far as I know”.
When Nidhiki a Toa, we know he wore a mask of Stealth in the same shape as Toa Nuparu. Now, was Nidhiki mask the same silver color and did he have the blue visor?
No, it would have been green
This question seems to be operating off of the assumption that the shapes are identical, which, as shown above, is not conclusive. (Does Greg not denying the unproven statement make it true? Maybe it does)
Also, there’s something else interesting here: This was a two part question. If we take Greg’s answer as answering both parts, then he is saying that the mask is not silver, and the visor is green. Meaning that a standard Volitak has a visor. (I might be reading a bit too far into this one. I’m pretty sure Greg meant that the mask is green, then he just ignored the part about the visor.)
1. Is it possible that the OoMN gave Mazeka the breathing tube on his Volitak to use when he has to be in an aquatic environment while spying on whoever needs to be spied on?
1) No
As Willess12 pointed out, this is not necessarily proof that the breathing apparatus exists. There is also the same question as above: The original question assumes that Mazeka’s breathing device is canon. Does Greg not shutting that assumption down make it canon?
2. Would a normal Kanohi Tryna (or any of the Toa Mahri’s masks) look the same just without the tubes?
2. Yes, probably
There’s that noncommittal answer again.
1. Is the Kanohi Garai that Hewkii Mahri wears in normal Garai form, or did the Ignika stylize it?
1. None of the Mahri masks are really normal, because they all have tubes coming out of them, for one thing
Just as he said “etc.” before, Greg leaves us with another cliffhanger here: “for one thing”.
This suggests that there are other differences with the masks.
[Also, only one of these questions asked Greg about the visor, and he may not have even answered it. Does a standard Volitak have a visor, or is that one of those unspecified changes that Greg alludes to? This is a question that, to my knowledge, has never been answered.]
So, as for my personal interpretation: I firmly believe that Greg wanted to make the Mahri masks the standard shapes, but he was hedging his bets in case Lego later decided otherwise.
EDIT: JACKPOT. Greg has addressed the visors, as well as Nuparu’s breathing device.
1 ) Is the visor part of Pohatu’s Kakama Nuva?[3]
1a ) …Lewa’s Miru Nuva?
1b ) …the Faxon?
1c ) …the Tryna?
1d ) …the original Kaukau?
1e ) Are visors optional on any of the above masks?
2 ) Do optional parts like Nuju’s eyepiece, the visors (if they are indeed seperate from the masks and optional), or Nuparu’s underwater breathing mechanism have to be incorporated in the mask’s production, or can they be added on later?
2a ) Can they be removed later, and does this affect the mask’s ability to function?
2b ) Are visors in this category of optional parts?
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The visors existed because of the environments the Toa were in. The Nuva masks are adaptable, and the Mahri masks were created to function underwater.
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They can be added on later
2a) Yes, they can be removed
2b) See answer to #1. Visors have not been added by mask makers.