“…However, such a dichotomous model does not necessarily reflect the athletes' individual variations in development or the underlying variables that could affect this development, because it is "likely that these variables can combine into a number of developmental pathways" (Ford & Williams, 2012, p. 349;Gulbin, Weissensteiner, Oldenziel, & Gagné, 2013). Such variables could include sports' similarities (Baker et al, 2003), number of hours spent in different activities , variation in the content of different activities (Ford et al, 2009) or the level at which an athlete practices and competes (Gulbin et al, 2013). Through earlier studies on elite youth football players, for instance, the early engagement hypothesis emerged as an alternative pathway to the two originally included in the DMSP, to cover the large amount of time such players have spent in footballspecific play rather than multiple sports or deliberate practice (e.g., Ford et al, 2009).…”