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So according to the 3-page rules, a pile in move is made when a unit is within 3" of an enemy unit and thus is considered and activates in the combat phase.
The rule specifies that all models in the unit can make a 3" move toward the closest enemy model.

If I have a unit spread out, and the far left model in the unit is 5" from some enemy unit on the left, and the far right model in the unit is 2" from an enemy unit on the right. Lets say that the far left model is 8" from the enemy unit on the right.
Can the far left model pile in 3" toward the left enemy unit, even though it is not considered in combat? What happens to coherency in this case?

They could do both ie left to left right to right as that is the closest model. However, only if you could maintain coherency...if not then none in the unit could pile-in.

I find the example a little hard to picture mentally, so I will outline some general principles of Pile-In.

Step 1: When you pile in, you may move each model in the unit up to 3” towards the closest enemy model. This will allow the models in the unit to get closer to the enemy in order to attack them.
Step 2: Each model in the unit attacks with all of the melee weapons it is armed with (see Attacking).

1. Models must maintain coherency when piling-in, as with any move.
2. Models must finish their pile in move closer to the closest enemy model.
3. Pile-in is optional on a model by model basis (so what Mj445 says is incorrect). You can choose to pile-in some models and not others in a unit. You may want to do this if your models are being "pulled" in opposite directions by their respective closest model.
4. So in the example you talk about, that model on the flank would have to move towards the other unit if its closest enemy model belongs to it, however it cannot break coherency so it would likely instead stay put - but this doesn't stop the other models in the unit from piling in. You might need to make a little conga line to keep coherency (as you aren't forced to move the full 3"), but you would be able to pile-in most of the unit still.

3. Pile-in is optional on a model by model basis (so what Mj445 says is incorrect). You can choose to pile-in some models and not others in a unit. You may want to do this if your models are being "pulled" in opposite directions by their respective closest model.

I assumed since he was stretched between units, that the pile-in would be unlikely as even if you can choose to not move some (which you are correct), moving to the right while leaving some on the left behind while maintaining 1" coherency would be hard. If he could not maintain coherency, like in such a case as his example, then he wouldn't be able to pile-in. Also we don't know how many models were are talking about here...one line? If two or more than yea standing still with some will maintain coherency.

Yeah that's right I just thought you were stating that if one model couldn't pile-in, none of the unit could. No worries!

Also in answer to OP, if you completed a successful chargebut are no longer within 3" of an enemy unit (due to casualty removal or other effects) you can still pile-in.

RoperPG wrote:
Also in answer to OP, if you completed a successful chargebut are no longer within 3" of an enemy unit (due to casualty removal or other effects) you can still pile-in.

You wouldn't be able to pile-in if none in the unit are within 3"

If you charged, but no models are within 3" due to casualty removal, you can still pile-in.

Really? Lokked in the rules and faqs couldnt find it.

Found it, Combat Phase "a unit that has charged or is within 3"..."

Thanks for the answers guys!

The clarification on the Pile-in for units that charged but are not within 3" due to casualty is also helpful.
I was confused at the purpose of units with Pile-in 6", that rule makes it more meaningful.

Mj445 wrote:
Really? Lokked in the rules and faqs couldnt find it.

Found it, Combat Phase "a unit that has charged or is within 3"..."

Yeah, I wasn't aware of it till recently when it came up in the coverage of the U.K. Alliance tournament. It's an interesting rule.

 Bottle wrote:

Mj445 wrote:
Really? Lokked in the rules and faqs couldnt find it.

Found it, Combat Phase "a unit that has charged or is within 3"..."

Yeah, I wasn't aware of it till recently when it came up in the coverage of the U.K. Alliance tournament. It's an interesting rule.

Yeah, was a "No they can't... I'm sure.. hang on.. what?!" moment for me, too...