I learnt about Hess's Law in Chemistry in 1976, so I guess Twiss's is Ok too!
I imagine Twiss's Law would be the number of goals scored at the end of a career is inversely proportional to contract length
Counteracted by Little's Hypothesis - amount of goals scored at end of career is inversely proportional to the square of the distance from your childhood home to the ground - in other words if you return to your home town club at the end of your career you score a bucket load.
I am prepared to believe we arevseeing Twiss's second law being formulated that introduces level in the pyramid as another variable. The same analysis could be performed for Little although level in the pyramid seemed not to make a difference for him