In football its about usually deciding who you want and then going and getting them , not many clubs go through the process of interviewing several candidates- its always better to have your target and if you cant tempt him then move onto the next target.
Many good managers would not put themselves forward for an interview or apply but would probably take the job if approached.
Apparently last season we wished to approach martinez and hopefully we will approach a club shortly to take their boss- no point in interviewing mccarthy ,grayson , etc out of politeness.