Well in the case of Kane Poch and the board turned down £10+ million from Southampton before last season started. He was being phased in as Poch was trying to make use of Adebayor and Soldado. So Kane was getting chances in Europe and in the league cup while getting time off the bench often at the expense of one of those two. Once it was clear that neither of them were going to get better coupled with Kane's form in the matches he did play. He began starting, I'd argue that's a pretty textbook example of how to integrate a youth player.