Hero Armor

What's the easiest "Hero Armor" to get considering GW's current state (hard to find groups).

The Brotherhood one seems harder than some of the Nightfall ones, plus I only need one to get the point in my GW2 Progress Calculator.

P.S: Can you buy those from other players?

Afaik you can buy all hero armor from other players. Also, easiest would definitely be the ones from Dajkah Inlet. The one in the Realm of Torment is pretty easy too once you get the hang of it.

Is the one from Dajkah Inlet (actually the one I was reading about, looks fairly easy. Pretty much like a normal mission) have a 100% drop rate?

No. The armors don't actually drop; each time you kill one of the bosses there is a chance one will appear in your inventory. If you're quick you can get through 5 bosses per run without too much effort.

I'm not a lucky player. It will probably not drop.

As someone who just recently(before the HOM announcement) started getting hero armors, I find the Shadow Nexus and Destroyer Challenge to be the easiest ways to acquire the remnants. The last time I did the Shadow Nexus with my Spirit Spammer I got 4 remnants in one go. I wouldn't go through the hassle of getting Ancient Armor Remnants, those I find even more annoying to get than Deldrimor.

I find anything related with end-game Nightfall/Margonite to be pretty hard. I'll try Shadow Nexus and Dekjanah. So it's fairly easy with H/H?

The inlet is pretty easy to roll through, yes. The Shadow Nexus limits your team to four players, but you also face smaller groups, which however get larger in number after a while of killing them.

Dajkah inlet is the easiest and you dont really need cookie cutter builds - my guild/alliance does it once in a while with no set builds - we take 7 normal chrs who are all mixed professions and any skillbars and last slot is for a healer.If you saw our team you`d probably be lol`ing at us but we like the challenge and we managed to survive a good 40 mins before being wiped.
What you need for dajkah inlet is good amount of damage dealers ( faster you kill foes the quicker you can get to the corsair guild lords and then on to the next ).
It could take several runs to get stolen sunspear armor but its good fun running amok

I've always found the shadow nexus to be the easiest and most productive place to get hero armour upgrades (plus the upgrades look decent as well). SoS spirit spammer, with MM, SS and HB monk heroes. As the start counter counts down, make sure you do a quick run around the map, because there are portals that aren't shown at the start in the U map.