Hey Hidude, thanks for making this in-depth post, it's definitely nice to be able to look at the objective facts and wars instead of having so many rumors flying around and being unsure as to what's true, it can be easy for rumors to spread like wildfire and for them to grow out of hand until they become a gross exaggeration of the truth. Thank you for gathering the stats so we can properly analyze. As one of T$'s main Milcom figures, I figured that I would have some valuable insight and analysis for this, although I will admit that I procrastinated far too much on this to the point where there is a chance that nobody reads this, or maybe nobody would have wanted to read a long post anyways from someone who's just a hivemind low gov snake. So let's talk.
The main divide here appears to be a question over what slot filling is. The definition of wars lot filling as per the rulebooks is:
Pablo already did an excellent job at addressing this but I do think this indicates that the spirit of the rule is that you cannot declare war so as to help the person you're attacking and so as to prevent them from receiving damage. For example, if we had Rose declare wars on e$ members, that would be slot filling because they are clearly in an allied relationship and are obviously declaring wars to prevent e$ from taking damage. Intent can be difficult to prove, but obviously if you're at war with a sphere, you are not declaring on them to help them. If you declare on someone with the sole purpose of beige farming, that only hurts them as they give you free time to restock and rebuild. The solution is to just have better beige discipline. If it's illegal to declare for the sole purpose of beige farming, clearly it's not very tightly enforced because lots of nations get away with it all the time and have all the time over the years and nobody has cared enough to ever report them. I've done this several times in the past, mostly to get out of being blockade cycled so that I can restock (omg T$ gov has been slot filling for years, they're such rulebreakers that they do it even before joining T$). I'd assume that nobody else ever even noticed those wars or bothered to check them out. That's a large part of why I'm in favor of just letting you declare wars on clear enemies and do whatever in them. If a random T$ member declares on a random TKR member, how many people would normally notice whatever attacks (or lack of attacks) are done? People would only notice in high profile cases involving high profile members or by random chance, in which case the rule would be enforced, but most of the time it would likely slip under the radar (as it has for years). I don't consider it fair to strike a small proportion of wars while the vast majority go unnoticed, so either the rule shouldn't be enforced this way or we'll have to start closely monitoring every single individual war during a global to make sure there's no "slot filling" going on.
A gray area comes when you attack a party not involved in the war. In that case, I'll say that it can be considered fair to have that be ruled as slot filling because that is far easier to detect and notice, especially with all of the technology the game has nowadays. That appears to have been Rose's issue in Guns n Roses for I don't believe either Arrgh or KT were officially involved in that war, although I was fairly inactive back then and was not involved in that war so I may be misremembering. It's for this reason that I can concede the current Celestial/Arrgh wars as Arrgh is not technically a combatant in this war, they've just had a few off hand raids after the first round. Hand of Fate blitzed us on blitz night and was a significant contributor to zeroing our military so I don't see how you can claim they're just innocently raiding. Arrgh's raids don't really affect a thing in terms of how the war is going. Hand of Fate's hits on blitz night did affect this war and they have, in fact, dealt more damage to Celestial than any member of Hollywood. Just because they have a bit of a different objective than Hollywood does not mean they are not at war with us. I await my downvotes from every HoF nation ever.
Ultimately, Sheepy should clarify the rule and exactly how it applies. Obviously he's not gonna monitor every war so some rule violations will get away, but it's best if the rule is clear so that there is no debate over this. I can't say I particularly care if he rules this to be a slotfill (although is it really worth having a rule that's difficult to enforce most of the time) but I would absolutely like for it to be clear and explicitly stated that this is slot filling and should not happen. I would like for the boundary to be clearly denoted so that there's not a question over what is slotfilling and what is not.