Given that Vince Iwuchukwu endured an episode of cardiac arrest this past July, he has appropriately been placed on a minutes restriction since being medically cleared to play. One would therefore assume that even under the best of circumstances on Thursday against UCLA, the USC big man won’t play anything more than 20 minutes, probably not more than 15 or 16. This shapes the central plot point for the biggest game of USC’s season to date. The fact that Iwuchukwu scored 12 points and grabbed five rebounds in just 14 minutes this past Saturday has understandably increased the excitement and…