Based on what we do know, the aircraft landed in IOM at just above minimum reserve when the wind was gusting to around 56kts. This was following a diversion from BHD which is quite close. Most of us (myself included) put a bit more than plog fuel on that day.
Personally I would have stayed on the ground on that particular day, the old adage "it is better to be down here wishing you were up there, than up there, wishing you were down here" applies. Had Douglas been out of limits, the alternative endings are not good ... still, with that tailwind, their range downwind would have given them a fair few options inland.