Well, I'll have a go at trying to figure out an answer for you. Keep in mind this is speculation on my part, not derived from any special or secret knowledge, interviews with the writers of the Legends or Selects manga, the Binder of Revelation, or transcripts of an audio drama only broadcast once over shortwave radio. Just me trying to figure things out with what has been established so far in the hopes of the coveted No-Prize!Much as I appreciate the explanation, I feel like my initial statement might not have been interpreted correctly.
What I meant was, how is having a giant trashed floating planet robot god-thing just floating in space "sealing" it anywhere? We've seen everyone from Cyclonus-pregnant-with-Galvatron's-head to Big Convoy's group come and go from the place freely, while "sealing" something in a place usually implies that they're bound to it or otherwise can't come and go.
I mean, granted, I don't know how they'd move it, but supposing they had a way, what is keeping it bound to the Triple Z Point?
So, the Balancing Act comic (tying in to Transformers: Cybertron) describes Cybertron as the "Stable axis of the multiverse" (when Universe Ramjet is going on about his idea of having Cybertron fall into the Unicron Singularity in the hopes of destroying the planet in every universe -- and from there annihilating everything). What does that have to do with BW Neo, you ask?
Well, in a similar fashion, in the Classics comics, we learn that Marvel-G1's Unicron explosion in 1991 caused a bunch of splinter timelines, as Unicron's very presence in a universal stream is thought to warp space, time, and causality in interesting ways.
(Case in point, the Grand Black Hole/Unicron singularity in Transformers: Cybertron, which TFWiki once opined could conceivably explain every continuity error in any work....)
Anyway. Toei-G1, as we have seen, tends more towards amalgamating than splintering when stress is put on the Timey Wimey Ball (e.g. incorporating RID(2001)), so if the "Triple Z Point" was at a Lagrange point relative to Cybertron's system, it could be dimensionally stable in a manner that might counter Unicron's destabilizing nature. So if his remains are placed there, they're less likely to slip into another universe* or corrupt causality (which probably already took a beating from the Time Window in 2010 and Megazarak's bombs in Headmasters... I have mentioned that Toei-G1 is a bit of a recursive convoluted beast, yes?)
*=well, at least until that whole Grand Black Hole Business, which ended Universe and presumably also pulled in Unicron-remains from other universes as well....
Last edited: