Paladin AA : Improved Stuns - question

Improved Stuns
This Passive Ability Improves your stun spells.
Rank1 Reduces the cast time of your stuns by 50% (this was purchasable pre-EOK, TBM I think)
Rank 2-3 Reduce most of your stun spells by 1 second per rank.

I have rank 1 and my stun spells 101+ (spells directly cast, not spells triggered by another spell) are;
Lvl 101 Ardent Force - Cast time of 1.0sec but modified to 0.5 secs, presumably by rank 1 of this AA and worn focus)
Lvl 101 Dichotomic Force - Cast time 0.0 secs (cheap at half the price for 8000+ mana)
Lvl 102 Lesson of Grief - Cast time 2.0 (modified to 1.0)
Lvl 104 Force of Ardency - Cast time 1.0 (modified to 0.5)
Lvl 105 Force of the Darkened Sea - Cast time 1.0 (modified to 0.5)

So my question is, does rank 2 of this ability reduce some (or any of the above) to insta-cast?

Also if it does, what is the point of rank 3?

Think the important missing word is "recast".

Dichotomic Force is excluded from the 1 second part for ranks 2-3

1: Increase Spell Haste by 50%
2: Limit Effect: Stun
3: Limit Max Level: 253 (lose 100% per level)
4: Limit Min Mana Cost: 1
5: Reduce Timer by 1s
6: Limit Effect: Stun
7: Limit Max Level: 253 (lose 100% per level)
8: Limit Min Mana Cost: 1
9: Limit Spells: Exclude Dichotomic Force


EDIT: Also what Brudal said It's 1 second quicker RECAST.

Thanks Brudal. English being my first language I sometimes take it for granted!