It was becoming apparent that the window of opportunity to play the game he loves at the highest level was closing .
Immediately after the Sabres camp , Cullen would undergo his second surgery on the same knee in less than six months .
It was becoming apparent that the window of opportunity to play the game Cullen loves at the highest level was closing .
Immediately after the Sabres camp , Cullen would undergo his second surgery on the same knee in less than six months .