On hunter's pets in Patch 5.1

I did some research on what people are saying is the best hunter pet in Pandaria.  While I agree with those who say for raids you need something that provides buffs missing for the group, i.e. complimentary abilities; I feel majority of the commentators are wrong when they say either pet is good for leveling/soloing.  Others suggest Shale Spider as a slightly better pet because of 5% buff to the major hunter's stat - Agility.

Small note on a side: I do a lot of soloing and in Pandaria, except in extreme soloing cases, you'd do just fine with ferocity pet, no need for tenacity pet.  

So I decided to use Zehera's Hunter DPS Analyzer to check some numbers against these theories.  I loaded my build from the armory and calculated DPS with different pets.

Generic Ferocity Pet (no buffs):

Ferocity Cat:

Cats used to be hunter's favorites in Cataclysm, providing the highest DPS boost when soloing and decent buff for groups too.  Now, with mastery buff, they are not as good as, say, Shale Spiders.

Ferocity Shale Spider:

As expected Shale Spider's buff  of 5% Agility fetches slightly better DPS than a cat.  Note this option is only available to Beast Mastery hunters.

Ferocity Quilen:

Then I decided to check out Quilen as a pet.  Quilen "Bacbka" is my recent favorite for LFR because of its Eternal Guardian battle rez ability.  It also provides 5% crit buff which, to my surprise, turned out to be better option than 5% Agility provided by shale spider.

I understand simulation has its limitation and crunched numbers do not necessarily translate into real-world DPS increase.  However I did this exercise for two reasons.  First, I wanted to see what I am missing in raids in personal DPS when using Quilen as a pet compared to other options.  Second, I observed better DPS with Quilen in LFR and wanted to see if simulation agrees with that.  Turned out to be for my particular build and case Quilen is the best choice.

Legendary Weapon

While I was working on raising my reputation with Hydraxian Waterlords by soloing Molten Core I got two halves of the legendary sword as a windfall.  It also required 10xEnchanted Elementium Bar which on a good day runs about 1,000 gold each on AH, but as soon as I got my pieces jumped to 5,000 gold apiece.  I just went out and farmed some of materials for the bars and bought the rest of the mats on the Auction House and  one of my guild-mates smelted it for me, so my overall cost was about 4,000 total for the whole package.

The quest is confusing, you return mats and halves to the NPC and nothing happens.  Good thing someone was floating on a magic carpet right above me, I figured his target was a boss right behind me, so I turned and killed it, returned the drop to the NPC, got the sword back and received a guild achievement.  Amazingly, level 25 guild with 400+ members and I was the first to get it.  Now, I still didn't get the personal achievement until I actually equipped the Thunderfury, Blessed Blade of the Windseeker, which I was able to do, even given the fact hunters are not allowed to equip melee weapons anymore.  Or are we?