Indeed,
He's a Blues and Royals officer in the Household Cavalry who is on attachment with AAC dont forget. That attachment is ending, so he returns to Household Cav. there is no way he will allowed to do another ground tour after his last ground tour went so wrong (thanks to the media) and so Staff Officer post it is and its definitely not uncommon for Captains to be based in the Staff Office so there is nothing special about his career progression apart from the security arrangements for his first ground tour.
He is also very, very keen on schemes to assist injured service personnel through the various charities of which he is a Patron so if, as the article suggests, this ground tour will allow him to do that through the Warrior Games then maybe he wants this post to be able to 'work on the system' from the inside and make a positive difference to the Army and the opportunities available for injured service personnel.