There are always thousands of 'ifs', usually they are irrelevant and armchair investigators should be ashamed. Just remember, there isn't a law making you take the shortest route or the fastest route or even the best route. Some people fly routes because they just want to.........
Why go the same old same old same old if you can afford not to?? He went that waybecause he did!! The aircraft was a suitable type to do it, so why not? The Mourne mountains are very beautiful all year round.
This IS a rumour network, if you have a rumour then I will fight your corner to announce it. However criticizing an acceptable route choice or whether a flight plan wasn't filed (don't have to) or stating the actual cause (without proof) of an accident is a bit tacky......