Never judge a book by its cover. You really haven't learned that yet, have you? (For those who didn't see the programme, his pre-audition comment on this clip, which can't be embedded, will show what I mean.)
Jonathan is undoubtedly a very talented young man but he is also clearly very vulnerable. Britain's Got Talent will hopefully make him, but it could equally break him. For now, at least, he needs Charlotte with him on the journey and she needs to be given the opportunity to shine too. Please don't mess with their heads, there's far too much at stake.