At least Pele would have gotten his prediction right then.
Not only born, the place you've lived your entire life. Maybe Jack feels Irish, if he does I'll be pleased to see him play for Ireland. IMO though it's more likely he feels English, what with having been born and raised here and sounding as Brummie as he does.
IMO it's not a debate about who he should play for, just about whether or not he should be vilified by Irish fans for some perceived slight on them (motivated by money / glory) if he chooses to represent the country he's from.