If anything there seems to be a mystery person at Wyndemere who is apparently lurking in the shadows, and he & or she is watching Ethan's every move at Wyndemere, and even Spinelli while he was on Spoon Island with Maxie, they sensed a presence at Wyndemere also, which makes me think there is someone there other than Ethan, who is there plotting something evil, something scary, and I like it.
The mystery person in my opinion is Valentin Cassadine, and he has finally arrived in Port Charles waiting for the right time to finally take his rage out on the Spencers and Cassadines
Valentin for anyone who might not know who he is, he is the bastard son of Mikkos Cassadine & one of his many mistresses but that Valentin was practically rejected by Mikkos at birth, denying Valentin of any rights and or privileges of the Cassadine name, disowning him. And that Valentin is the only person who Helena actually fears, and Helena does not scare easily, and that Valentin hates all things Spencer and hates his own family the Cassadines too and he is determined to take his rage, his anger, his revenge out on any Spencer and or Cassadine who he can get his hands on
It makes perfect sense for him to be the mystery person at Wyndemere, and that maybe Valentin was the one who saved Elizabeth at Wyndemere on Spoon Island and that he just left her there and vanished as soon as he saw Spinelli coming
And I think Valentin is going to be the new doctor at GH, Dr. Ewen Keenan using this name as an alias much like how Theo Hoffman used his name as an alias for his other identity The Balkan, Valentin will do the same.