no, croat slovene (he even spoke slovenian passably well according to one person I knew from there)
Yup, he definitely spoke Slovenian. His village was only 2km away from the Slovene lands, and he spent a lot of time with his Slovenian grandparents.
This might interest you - he also spoke English - youtube.com/watch?v=pYSe08OtrHE . You can really see his immense charisma in this video, much more so than most. Apparently he was also quite capable in German, and could even get by in Czech and Hungarian.
He was not a Serb, but he was the only person capable of holding Yugoslavia together.
Yup, it was never going to work as a state without a strongman in control. I always wonder as to why he created that insane structure for Yugoslavia before his death, rather than grooming a deputy. Although, I've seen it mentioned in many places that people were loyal and faithful to Tito because of his immense leadership during WW2, and that no successor would have enjoyed the same respect.
I've also been to one of his 30-odd villas in Igalo, Montenegro. It looks exactly how you'd imagine Tito's villa to look, even down to the massive personal swimming pool.