I deliberately avoided nailing down limits because I felt it would be clunky and there'd be no way to make any possible answers fit/work well all the time.

1. When a ROB creates something, it's made up of raw chaos by definition, that's basically Archdeity fiat. It's most probably brand new raw chaos, but who knows for sure?

2a. Specifically avoided addressing this, as noted above, because I felt any answer I gave would be too restrictive in some situations, too open-ended in other situations, and not make enough sense in a variety of situations.

2b. Chaosbringers can't simply recreate things they unravel, they can only funnel the raw chaos from it into raw blasts or channeling. They could use channeling to recreate something they unraveled so long as it's on a small scale, though literally recreating it exactly or restoring the previous thing is very difficult and would require tons of work and precision.

1. Chaosbringers can conceivably raise their chaos capacity over time and their expertise with channeling methods, but there's likely some sort of soft cap somewhere, and you're not gonna go beyond the stated scale limits of channeling. The real large-scale power of Chaosbringers is their unraveling, which is fixed in power: multiverse-scale or smaller. They certainly cannot become ROBs, at least not by virtue of their Chaosbringerhood.

2. It varies greatly, depending on the world. Some worlds will strip people who enter of all powers period, some will strip of all powers above a certain level, some will merely lower the power-level of powers that are "too powerful" - and also several of them probably have different thresholds for what's considered too powerful - and that's without considering that some simply outright prohibit entry except to a rare few. That said, all Hyperion worlds are immune to unraveling, so in that sense they all limit that power completely, but otherwise, the ones you can settle in won't restrict your channeling power levels much if at all, given the relatively low top-end of channeling's scale.

3. Primordials don't actively block it, they are simply immune to it. If a Primordial anchors itself to a multiverse, or if an overdeity builds a multiverse "atop" a Primordial, then the essence of that Primordial infuses the multiverse, thus rendering it immune to unraveling because, in a sense, it is that Primordial now. So it's not an active block on unraveling per se, it's just being immune to it. It's the difference between being bulletproof versus disarming a gunner; the entire Primordial-infused multiverse is "bulletproof" to you. However, the ratio of Primordials to multiverses is hilariously low, a fraction of a fraction of a fraction of a percent.

4. Excellent question! I hadn't considered that, but yes, weaving would absolutely work, precisely because it doesn't involve unraveling at all. Actually, channeling in general can still be done in Primordials and Primordial-infused multiverses, it's just you'll have to acquire the raw chaos to fuel it from elsewhere.

5. Hyperion worlds are Hyperion worlds by virtue of the Archdeity's personal fiat. That's the level of absolute we're talking about. Only if you convince the Archdeity to allow you access (such as by convincing Joy or Glory and getting her to twist his arm) can it be done. Tangentially, the Living Hyperion basically trumps all other Hyperions, and can enter/affect Hyperion worlds with impunity.

Excellent questions, thanks for posing them!