Logical fallacy: lack of evidence against something does not prove it. There needs to be evidence that the Metru build is that one piece.
And hey, I’ll grant you that there is actually a really good piece of evidence for it: the fact that every Metru build set uses it. But is that evidence alone enough to say it’s the only way to make a Metru build? Consider this:
A) the Metru are from an era of clone sets. If the Metru came out in 2008, would they use that piece?
B) the Metru are sets, not mocs. If a fan designed the Toa Metru, would they use the same piece?
So I’ll say this: yes, a Metru build is easiest to make by using the gearbox, but it’s possible to make one without it. I’ve done it, Dag’s done it (two different ways). Lego wouldn’t have done it, because that would push the budget of the set past the canister build. But Lego also wouldn’t have put out something like this as a set. That’s the point of MOC contests. We’re not doing set design contests.
I’m going to stop you right there.
This is not the argument. Never has been.
Greg has NEVER said “they all use the same torso”.
You continue to say “Greg said I’m right, therefore it’s canon.” That’s not the debate, the debate is whether your interpretation of his words is canon.