1. been either or both of a) very fortunate with injuries
You really think there's any discussion other than they've cllearly god moded with injuries ?
clearly that is the most likely explanation
there is a view that the huge investment in sports science the club has made has made a real impact on lessening the number of muscle injuries
to quantify this the thai owner investment is now up at £170m, and has included not only buying the stadium, clearing off the debt, playing staff, management, scouting but it is is estimated over £40m on sports science teams, equipment etc. all of which has been FFP allowable/ an FFPoffset.
i went on a training ground tour recently and its like walking round a small hospital, in parts
the club runs seminars on sports science, eg attended last summer by Arsenal, spurs amongst others and a fortnight ago on recovery times and individual training pans etc attended by clubs across Erope
clearly no back-room team can do anything about breaks, cruciates etc and clearly a lower number of games this season than the big boys is a factor allowing recovery plans etc but when you look at the incidence of muscle injuries at arsenal, united etc and compare to us, over three seasons since the big investment by the new owners on this, you might conclude there is something in it over and above the good fortune you allude to