boytsov and solis are unproven, so are dirrell and ward. the world would, and boxing fans, would much rather see legitimate prospect/contenders with top level skills fight in the tournament, rather than old men who were never really that good in the first place
From Europe I guess I would put Povetkin, Boytsov and Haye in. From the United States I would put in Chambers, Arreola and either Solis, Johnson or Quezada.