The most remarkable thing about Aaron Ramsey's season so far is not simply that he has scored as many goals in three months as he had amassed over the previous six years for Arsenal.
It is not even the variety and the quality with which he adapts his game to Mesut Oezil and feeds off his new German team-mate.
And it is also not what Arsene Wenger says it is - confidence - that has made the 22-year-old Welshman such a potent game-winner.
Take all of those, and there is still one more factor beyond them.
That is that Ramsey lines up in the third tier of Arsenal's attacking formation. He often starts alongside Mikel Arteta or Mathieu Flamini, just in front of the central defenders.
For his match-winning goal in Dortmund on Wednesday, Ramsey had to sprint beyond Santi Cazorla and Tomas Rosicky.
Having been involved in the swift inter-passing that started the momentum, the Welshman kept running straight ahead.
Maybe through all the training they do together in London, Ramsey was thinking three moves ahead.
Maybe he anticipated Oezil chipping the ball from the right towards Olivier Giroud.
And anticipated that Giroud would win the aerial battle and knock the ball down.
Then, the third element of guesswork from the man running from the third tier of Arsenal's team; perhaps Ramsey sensed that the goalkeeper and last defender would dither so that he could nip between them and head the ball across the line.
Is all of that intuition? Is it confidence? Is it practice?
Or is it the inner sense of a player who has just discovered the finishing instinct that is as hidden to view as the homing instinct in a carrier pigeon?
I read a different theory the other day from somebody trying to fathom why Ramsey has hit a streak of 11 goals in 16 Arsenal games (compared to 11 in 150 previously).
The theory was that because Ramsey had broken his leg and feared for his career two seasons ago, he was now a new player - more determined, more aware, more of a glory hunter.
All, or none, of the above might be part of the answer.
But none of it would be happening now if Ramsey did not possess the talent and the physical energy to get himself into striking situations, and if Wenger were not such a good judge, and such a patient manager prepared to spend years nursing the broken Ramsey back to, and beyond, his potential.
Has Oezil played a major part in Ramsey's extraordinary run?
Yes, of course. Oezil's perception to deliver a pass, Giroud's willingness to be the focal point and create for others, Cazorla's incredible eye, Rosicky's touches.
It all helps, it comes from incessant rehearsal, and from the complexity of work ethic and liberty that Wenger coaches.