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So in 6th the faq existed which limited the effects gained from PfP to only models who had the rule.

Old faq:"Quote :
Q: When a unit comprised of some models with Power from Pain and
some without has a pain token, does the effect it gives apply to every
model in the unit or just to the models with the Power from Pain special
rule? (p25)
A: It only applies to the models with the Power from Pain
special rule."

In 7th the faq was removed and we are left with RAW from the codex which states:

Each pain token confers a special rule to the entire unit, as shown in the list below.

So without a FAQ it looks as though any unit containing tokens benefits from the list.

Discuss.

I took a more careful look at how tokens are passed around, and it isn't as easy as I thought.

Yes, a unit with a pain token gives the bonus to the whole unit (in 7th).

But, how do you get that token?
To share the pain, the rule says "If a Dark Eldar unit is joined...", so you can't have a Haemonculi join a seer squad to pass off his token, because they are not a dark eldar unit. Further more, should he join, the token ceases to do anything, because the token rules say "a unit with the token" and an IC with a token, attached to a unit without a token, is a unit without a the pain.
So what can you do?
If an IC leaves a squad, you do split pain tokens (no requirement for the IC to be a DE). So you could have a farseer/autarch/phoenix lord grab a few tokens, but he can only use them when he is all on his own.

You could run a Parasite Engine and pass out pain tokens to anything that's a "Friend unit".

You can give pain tokens to beast packs.

You can attach an eldar IC to a unit with pain tokens to gain the bonus while he is attached.

Outside of those 4 options, you're only gaining use of pain tokens by units with the natural ability to use the pain. Doesn't seem nearly as good as I thought it was going to be.

Ah much hated 'for all Rule purposes' clause, we meet again.