Actually doflamingo is enjoying the plot shield at the moment. He has to be beaten by luffy.
All that bull crap about organs repairing is a joke.
That is exactly what I mean, what most people don't realize is that Doflamingo is nothing compared to some of the guys Luffy will be fighting later on.
If Luffy can't beat Doflamingo on his own then he has no business challenging the Yonko.
Sabo is probably stronger than Doflamingo, we simply haven't seen much of him yet, he was able to challenge a Admiral, and even the weakest admiral can drop Doflamingo no diff.