Personally I am not too bothered by losing the Planetary Datalinks. He is a Pact Brother, and to deny him both seems a little cruel, and he can rush well too, so he will probably be able to rush it before we can. I would say build the CDF, and forget the PD. He is an ally, and can share information with us easily, so having his research quickened would be little disadvantage IMHO. From an RP point of view, I'm more concerned with not having the Empath Guild, and hence the real primary keeper of information.