Did I really do all of that by myself? Beware the royal "WE"
Good to see some questions that drill down and ask searhing questions. However as someone who has done more than a fair share of interviews I would like to suggest that these questions will always give you the response that the candidate will either want you to hear to make them look good, or giver you the answer the candidate thinks you want to hear.
In HR circles there is a phrase that says "past performance predicts future behavior", which means that you should be looking to see what a person has done(by there own effort and not that of others)and how they accomplished it. Look for there actual role in the fantastic project they are telling you about - are they an active member of the team or relating what they have observed from the sideline!
If the candidate has had the experience they will be able to fill out all the details otherwise you will be faced with a vague explanation and sweeping comments that have no real substance.
Sorry I can go on for hours on this subject so I will call a halt there. I hope this will be useful.
CT