As I said, for me there is too much doubt whether it was actually Euron who hired the FM.He could have brought the faceless man with him on the boat and just waited until balon was dead.
As a theory, for me, its not as strong as "Frey Pies".
Edit: Re: Euron, I should add that I have no idea who else would hire a FM to kill Balon. We haven't heard about anyone having any grievance against Balon to go to the extent of hiring a FM and to afford their price. And if Euron is to be believed he had a dragon egg, (which I think he says he threw it in the sea) which given their rarity might be considered a good price for killing Balon. You could also say that since Balon falls off the brigde, Euron was probably referring to that as what he did with the dragon egg went.
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