We'll likely have to just break it down to a manageable size. [He suggests as he observes the Doctor.]

First thing I looked into. Given that I've had experience with that sort of a chip before, I was not inclined to having another one to deal with.

The information available from the rebels has assured that controlling someone through these chips isn't one of the functions, and while I do not think that is something they would have any reason to lie about, I am not sure how extensive their research has gone into such matters, save that they've obviously been dealing with these far longer than we have.