Well, you can deploy an independant character in coherency with another unit and declare them attached. However, that does not change when the IC is deployed (ie: a HQ must be deployed only when HQ units are allowed to be deployed) and the deployment must be within the IC's own abilities. That is, the only way an IC could deploy attached to an infiltrating squad is if he also had the Infiltration ability. I believe some Chaos HQs can have infiltration, but as far as I know, there is no way for a Farseer to have it.
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