Sindelar was a amazing player, but the importance he has rellies not only in his technical skills.
He and his manager, Hugo Meisl (another insteresting add for a manager), developed a new role for him: The withdrawn forward.
This role made him a nighmare for opposing defenders, specially british ones, and put him in the history of the evolution of the game.
He could have Drops deep to get the ball as a preferred move, and instead of 'likes important matches' he could have 'likes matches against british clubs' (I know is impossible, just joking).