Good luck to him if that's where he thinks his career is best progressed . No point talking pragmatism to teenagers , much better they make their own decisions , and in many respects being a 'bigger fish in a small pond ' is not a bad one , and no doubt he loves his Irish heritage as much as his English one so no issues really.
It was great to see Kieran score his charge down try for Ulster last weekend , the only thing that is slightly irritating is the habit of capping young players in meaningless International Tours to capture them , then sending them off to see how they shape up for the future - Treadwell and Lang fall into that category ( with countless others , so its certainly not just an Irish thing )