No idea - have they said that all players that were eligible to play still can, even if they have now aged out (would seem to make sense as an approach)? If so, then the only thing I can think of is if he or BU or the Blackhawks don't want him to get burnt out or risk injury playing all that hockey before the season starts. Would love to see him play in it.
Opted out to fully prepare for BU season is the word on the street.