Like a lot of the heavier racers, the tandem pair suffer on the rolling/hilly routes, although they have improved their 5min W/Kg in recent weeks.
IMO because he has 5 min 30 secs of 3.15w/kg and 6 min of 3.16w/kg. I thought, on this forum, that zMAP could be as far out as 6min if your very short term power was high?
my zmap almost always matches my 6 min watt for watt. at least every time i look at it. not sure that’s a particularly common phenomenon though