I think the better idea will be for Pacman to fight Raheem first coz I think he is a smaller and less powerful version of PBF (the way Raheem fought Morales reminded me of PBF). If Pacman can beat Raheem convincingly, preferably by early KO, I think it'll be a fair game for him to face PBF. So I think fighting Raheem is a must for Pacman before even considering to fight PBF.