I have concerns about his maturity and judgement. I feel that his naive nature would negatively affect his judgement and his overall performance as an administrator. If he were to maintain a mature and clear judgement, then I would have vouched. Currently, I feel that this applicant lacks both of these.
Also, can we please not approve applicants on the basis that they are active or that they have ambition alone? This mindset can and will lead to many poor quality admins. An admin can be incredibly active, but what good is that if they don't have a clear enough judgement to make well thought-out decisions?