Makes sense. I was surprised that no one had to die to bring him back to life. But, maybe I shouldn't have been since Thoros brought Dondarion back to life multiple times without anyone being sacrificed.
Perhaps you were referring to Jon being a darker, less human version of himself. I think that also makes a lot of sense.
One thing that I am very interested to see is what happens at the wall going forward. I expected Davos to take Jon's body south of the wall before he was brought back to life. Now that he is back, he will still be the Lord Commander and would seem less likely to head south to take on Ramsay at Winterfell. Since he died, he is no longer bound by his oath, but I have a hard time imagining him leaving his brothers without a leader to take an army south to Winterfell.