WI: Vlad the Impaler assassinated in 1451?

Title says, it all. What would happen if Vlad was assassinated shortly after Bogdan, what with the future of Ottoman expansion and all? Pretty simple premise. If I anything needs clarification, please ask.

I appreciate any input.
 
Would Radu the Handsome actually take power? I kinda envision a scenario where Vlad Tepes gets executed for some minor mishap by the Ottomans, causing Radu to bear a grudge. I call this scenario into a future TL "Beware of the Bloodhound", because I wanted to see Radu become as brutal as his dead older brother.
 
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