I think jumping 200 places/positions is quite possible, but not so much 200 brackets (i.e., there are 10 guilds per bracket, so 200 places = ~20 brackets).
Here’s some data from our last GW:
We don’t have all statues maxed yet, and we’re not quite at full participation (150 battles), but we’re getting there/doing okay. The +150 in Ranking = +15 brackets. We have jumped ~33 brackets before, but we were lower down, and only scored ~500,000 points or so (with opponents scoring less, too).
If we keep this up (and I doubt we can, since our brackets-jumped will most likely decrease over time), we’ll get to bracket 100 by the end of the year 
. This IS something that newer players/guild members ask me about, as well, and it sucks that I don’t have anything good that I can tell them (e.g. “What’s the point of GW?”).
I don’t believe it does, aside from the brackets they drop to adjust for guilds that are jumping over them. It’s actually really disheartening for me to see screenshots of dead guilds with 0 points at the end of a GW week in bracket ~50, say, dropping 1 or 2 brackets a week.
I think this is actually a significant issue re: the bracket-jumping formula. If you have 2 high performing guilds in the same, low bracket, only 1 of them will be able to benefit from the bracket jumping, I believe. I.e., I don’t believe the formula accounts for localised disturbances/chaos, which makes it much less effective than one might think it is. @Kafka this is something I’m actually quite interested in, and would you be able to share if this has been taken into consideration?
Hypothetical case in point:
- Imagine all guilds in brackets 300-400 (if there are 400) score somewhere between 10,000-50,000 points - a fairly low score.
- In bracket 370, there are 2 high performing guilds that score 1 million and 900,000 points, respectively.
- How many brackets does the 2nd guild (with 900,000) points move up?
I believe it would only be 1-2, currently, while the 1st guild (with 1 mil points) would potentially move up ~30-40 brackets (although I’m not sure, and they might only move up 1-2 brackets, as well) - and if so, I would believe this to be a flaw.
This actually seems like a decent point 
I mean, I know they don’t 100% rely on the community to report bugs, but it does mean that in these situations players are reduced to coming to the forums and saying, “… Is this how [guild wars scoring/brackets/whatever] is supposed to work? This seems wrong, but… Yeah, idk. Help?”
I can still totally understand this side of it, though: