Hong Kong’s top two bureaucrats are limbering up to present themselves as challengers to the deeply unpopular incumbent Chief Executive C.Y. Leung, 62, whose term ends next year. The two are Chief Secretary for Administration, Carrie Lam, 59, and long-serving Financial Secretary John Tsang, 64. Both are life-long civil servants. However, it is not clear where they are serious challengers to Leung or are simply going through the required motions to make the selection process look a genuine contest.