Question about Necro pets 53+

[Dotjuu]

Effective use.


53- Minion of Shadow - Rogue pet
This pet is very nice in the damage department. I love fear kiting with it and it tears stuff up. In a odd group where we have pets tanking he seems to RIP aggro literally on the first hit from any other pet. Be it a Charmed pet or mage/skelly/ench pet.

56- Servant of Bones - Monk pet
Haven't used this one but does it have any uses? Is it worth the effort to procure this item for myself?

59- Emissary of Thule- Spectre pet
What are the primary uses for this pet? What DPS difference does it have between the 53-56 pet? Apart from a much larger almost double hp pool/Fear resist/ Higher lifetap.
In terms of damage is it comparable due to its lvl it is a lvl 47 pet + 1 if you have focus from Cazic.

Why does my 53 pet at full hp always pull aggro from another pet. But as soon as a player comes into effect it's safe?
Is it due to lvl/hp
Borked aggro?

Anyone that has experience with these pets/mechanics if you could possibly take your time to answer these important questions to me I would highly appreciate it.

Dotjuu