By Alex West Prince Harry is expected to return to the United Kingdom for a speaking engagement, but Meghan Markle holds some power. According to a leaked guest list, Harry is setto speak at the Invictus Games 10th Anniversary Service at St. Paul’s Cathedral on May 8. Meghan, on the other hand, is listed as “TBC,” meaning her potential appearance is not yet confirmed. It was previously reported that Meghan’s appearance would mean their children would come along, too. Now, it seems that Meghan isn’t confident about accompanying Harry. While she was planning on coming at first, Meghan recently b…