It was a 380 not a 777, and therefore had fewer options of where to go. Add to that it was one of MAN's biggest customers, and (presumably) the handling agent had sufficient staff to deal with it, then why not? Also looks like a gas'n'go as it was only at MAN for 80 mins. Although there are no guarantees once the wheels have stopped turning that a diversion will leave rapidly, looking at the LGW weather last night it looks like the high winds were not forecast to last too long, and presumably the crew were OK for hours (DXB-LGW isn't that long a flight) so it appears that a sensible decision was taken in view of the likelihood that it would be gone by the time many of the home based aircraft came back.
All a bit different to a weather forecast that is poor for longer, which could lead to a much greater influx of diversions.