Yeah, I'm not sure why they changed it to hide the Talk pages like that. I guess they would prefer if we used comments on pages? But that just clutters everything...
In terms of stats, no. In terms of damage output, yes. PG is +25% damage, DW is +50% damage, relative to OH, assuming all parameters are controlled for.
The second weapon is averaged with the main weapon as if Rush were using DW. Half of its modifier is also added, but it's not exactly noticeable until you start trying to achieve all sorts of damage bonuses and synergy. And finally, even though the second weapon isn't actively used, its effect is already taken into account.
Just need to think outside the box a little bit.
1. Yes, DW is the strongest stance not just because of having a second weapon. The second weapon also means being able to attach another effect. But it does average weapon stats and tanks evasion. But if all you care about is damage, then DW is the best.
2. OH + Shield is great when set up with a lot of evasion boosters. Damage isn't the greatest, although shield bashes will make up for some of it, but at least Rush has less of a chance of dying.
3. That depends on the equipment. As an example, Might Longsword vs Might Zweihander. Their stats are quite similar, but the Longsword has slightly better EVA and CO/CD rates. Plus, the Longsword is small enough for Rush to double up on its effects.
4. Weapon Arts are nice and all, but I'd rather be able to consistently use Rank SS arts. Unless you happen to have a setup for feeding Rush union morale.
Oh, and the idea of "no WA for OH weapons while in PG?" Take a look at Neo. He uses L-Swords, which he can use in OH or PG. Holy Win requires Highbrand + PG. He can also get to Assassin, which requires OH. So it's not quite right to state that. It just so happens that the WAs have specific WS requirements.
Weird... I didn't have any issues with oggextract. Pretty sure that I've archived them somewhere. If not, I can try to extract them again. I remember it being a bit of a messy job though.
It also has the Jhana symbol requirement, just like the Yellowcap Vanguard and Redcap Champion. BR doesn't affect when rares spawn.
PC version, no, although you can use a trainer to add whatever you need in your inventory. Or using it to directly change what your units are using.
X360, yes, although it does mess with your save in funny ways.