Yes of course - Jeremy has a whole load of people researching and looking for information on all sorts of things, like most of the other candidates I should imagine. Do you think any of the candidates would be able to answer all the questions put to them without support and research that has been done by other people? This is why the greens are so knowledgeable, they have a "think tank" that provides them with information and it's excellent. This is sound commonsense - no one person has the time to do all the research necessary over such a wide variety of subjects. This doesn't mean a candidate doesn't have his / her own point of view or is reflecting the opinion of the researcher, just that they are better prepared to make sensible, well researched comments.
Do you think the establishment candidates do their own research or even write their own speeches?