25M Heroic ICC (Re-)Critiques!

Realm: Icecrown
Hello!

I have returned to this server after a 4 year break! (Seeing the WoW Classic gameplay videos made me ultra-nostalgic to play WotLK again haha). I doubt any of you remember, but this my original critique post: http://forum.warmane.com/showthread.php?t=334878.

Today, I wondering if the following ICC 25M raid composition still holds true after all these years! All critiques welcome!

Also also, I am not doing a "true" solo multibox; my brother and some friends will be playing the various melee dps classes. The goal is to have as many of the same class as possible (for multibox ease) while keeping DPS as competitive as possible. Obviously classes like fire mage are difficult to multibox because they rely on procs, so Shadow Priests will do haha.
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ICC 25M Heroic
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Raid Buffs

Tanks
Frost Knight - Horn of the Winter, Improved Icy Talons, main tank
Protection Paladin - +1 Greater Blessing , +1 aura, off tank

Healers
Holy Paladin - +1 Greater Blessing , +1 aura, heals tanks
Restoration Druid - Mark of the Wild, heals raid

Ranged DPS (mainly for buffs/utility)
Elemental Shaman - Bloodlust, Elemental Oath, Spellpower totems + other totems
Arcane Mage - Arcane Intellect, Slow, Arcane Empowerment
Affliction Warlock - +1 Curse, Fel Intelligence, Improved Shadow Bolt
Destruction Warlock - +1 Curse, Improved Imp, Improved Soul Leech, Demonic Pact
Marksmanship Hunter - Trueshot Aura

Physical DPS (mainly for buffs/utility)
Fury Warrior
Combat Rogue
Retribution Paladin
(Though really these three don't bring any good buffs that aren't supplied by another existing class.)

DPS Multibox
Shadow Priest x 25, this is going to be the class that is multiboxed