I could be missing something here ... but doesn't Manchester have Dual Rwy Ops .... normal mode of operation 1 for Arrivals and 1 for Deps?
Therefore no need to take into consideration any inbound traffic (unless non dependent dual rwy ops would be comprimised) and with nobody else taxiing out for departure, the most logical solution would be to delay a Rwy inspection by 2 mins rather than the EK dep for 5 mins.
Just a thought.