Improved Leader of the pack vs defense rating capped

[debunk]

hi guys..got 2 issues here..

1. when we hit our bear def rating (142 def rating = 415 defense) meaning technically we are uncrittable by a level 70 mob or 73 bosses..so does putting 2 points in Improved Leader Of The Pack (where we have 100% chance to heal ourselves when we get crittaly hit by melee or range attack) does us any good or it just a waste-point spending there?
2. by hitting our def rate cap..does it really mean we are uncrittable aka immnue to crit or we still have a slight chance to be crit (either by mob or boss)? if the answer is YES then it will also answered my no.1 question above..

[Bearicade]

You always spec into Imp Leader of the pack no matter what feral spec you go.

[Metalfang]

Man a boss crit is far more than 4% of you HP regen, and talent is heal when you crit you (not the boss hit you).
Your group; rogue war etc... will be healed too when they crit (6s internal CD)

[Hillnor]

As they have already said, YOU HEAL WHEN YOU LAND A CRIT, not when you receive it.