The 2nd factor is graduation. Orelvis Martinez and Will Wagner are still both considered prospects, and the Blue Jays will probably see appearances including Alan Roden, Adam Macko, Adam Kloffenstein, Jonatan Clase, among other.
But it isn't all bad. The Blue Jays are high on some prospects in the lower levels of their system, as well as some of the international players that were signed, most notably Christopher Polanco and Keegan Pieternella.