He's five foot midget ffs, of course he's going to lose 80% of headers, because 90% of the other players in the prem are taller than him. So one could easily interpret that he's doing 10% better than he should be.
This is the problem with stats, they don't tell a story people interpret them as they see fit.
Peter crouch probably 'wins' 80% of his headers, but most of them come to nothing so what does that stat tell anyone? diddly squat.
This 'soft spurs' (which I would pre-suppose is a term you have created for your own benefit) could be attributed to a myriad of reasons, some of which any one of us can mention but that no-one will ever really be able to speak definitively with any authority about because people are complicated things. Stats lie, people lie, people are inspirations and people are stupid.
You are casting assertions on one of our players, I dislike that notion. I equally object to your equation of 80% losing headers = not trying = needs to be told to try = would rather be going and getting shitfaced. Because ostensibly you are taking a pure isolated stat and bending it to fit 'your truth'. That is the domain of 8 year olds, politicians and internet dunces.