It's hard to answer these since so many variables are involved, but you guys set a very end-game goal, so I'll speak in terms of late-game at the least.
1. You are correct, especially since you can easily reach the dex required with <23 base (egged HTPs beat MoNs now since MoNs can't be potentialed). If you can equip a Night Raven Wing or Stonetooth without bringing your base dex above 23, it will be hard to beat a 2h sword.
2. You'll want scrolled 3 line warrior gloves lvl 71+. You can only get %damage/crit/attack/etc on weapons, but you can still get %str on gloves. Shoot for about 14 attack 3 line lvl 80-120 gloves (top tier, perfectly 60%ed and hammered). Obviously, if you get something like 12 att 3 line, that will be fine as well, and if you get the chance to beat 14 attack, go for it.
3. To understand cubing, you need to understand how potential items work. When you get an item, it can have hidden potential (or you can use special scrolls to make an item potential). Once it is potential, you can unhide it to get extra stats. It will either have 2 or 3 lines, and that will never change.
The item "tiers" are as follows:
<30, 31-70, 71-120, 121+. This means that the best warrior armor will start at level 80 (that's the first armor since 71). The only warrior weapons 121+ are VIP Swords/axes/blunt weapons, and if you can get one of these, it's obviously going to top a normal sword. The Swords are close to max meso unpotential. Landing a 3 line is going to require a ton of luck or an obscene amount of mesos. That said, I'm going to exclude these when I discuss your pot weapons.
When you first unhide an item, it can either be 2 or 3 line (like I said earlier), and it can be Rare, Epic, or Unique. Rare is the worst, and Unique is the best. The stats that are given are completely random, but it's most common to start at rare. I seem to start at Epic about 10% of the time, and Unique seems to be around 1%. Cubing resets the item to a hidden state. You can cube an item as many times as you want. The selling point to this is that an item cannot move down in lines or "value". If you have an Epic 3 line item, it will NEVER go below Epic 3 line, even if you reset it with cubes. You can move from Rare to Epic to Unique, but you cannot move from 2 to 3 line. Generally the first line and 3rd line are the best, while the 2nd line is a step below.
You usually want to get a potential 3 line item before you start scrolling. So, if you're looking to scroll some warrior gloves, buy or make a bunch of 3 line lvl 80+ gloves, then spam scrolls on them. If you come out well, you can continue cubing it to get the stats you want and won't have to worry.
This ties back to shields. If you can get a decently scrolled 3 line attack shield (let's say about 12 attack), that will beat a 2h sword.
Even if you just go for %str on the first line of each item (getting %str on 2-3 lines of every item is very expensive), and a good stat on weapon (%crit, %damage, %boss damage, %attack, etc), you'll be very VERY powerful warriors. Only focus heavily on scrolling for attack. Don't fret too much if you don't come out with a godly scrolled str top. Invest your time and money in cubing and scrolling for attack.