To me Jonny just seemed like an ordinary bloke who was determined to have a laugh. Agreed he did not take nomination very well, but I don't think he ever "manipulated" people into not nominating him. Remember he got huge majorities to stay in from the public against Lee and Sophie, and in the "four nominations" week hardly registered on the scale. After that week, there were no nominations the following week, and the week after that, when they were down to five, Alex and Tim were nominated because they seemed to put a dampener on things when the other three seemed to want to have fun. So if Jonny did try to manipulate people into not nominating him, it did not work.
I cannot understand this view that because someone did not conspire behind other people's backs, because he did not smile at people then organise against them, and because he wanted to have a laugh, he was somehow up to something!
And even when it didn't matter any more, when only Jonny and Kate were left in the house, he was exactly the same, plotting little craics with Kate as to how to react to the winner's name, with a twinkle in his eye like a naughty little boy, right up to the end.
As to whether he fancied Kate, I'm sure he did, but that does not necessarily mean he would leave his fiancée for her and their brother-sister relationship was almost as sweet, and honest, as the "biggie" in BB2.
Yes he had a plan. It was to treat the whole thing like a 9-week beano and take every opportunity to enjoy himself. The public obviously enjoyed it. What's wrong with that?