9 Articles; 4,800 Posts
It gives you the opportunity to get your name out there as someone who is interested in whatever you are interviewing for. And don't ever be 100% sure that someone already has the job in the bag. The person may decide not to take the offer, may not like it once orientation is through--lots of things will and could change. So wholeheartedly interview--you never know where it could lead.
JDZ344
837 Posts
It's not always guaranteed that that person will get the job. They might decide not to take it, or it may all be gossip. Go anyway. If nothing else, to gain interview skills.