This article misses the point completely.  We do not stretch before practice so that our muscles perform at 100% and draw maximum power from the very start.  Personally, I care very little whether I'm performing at 100% for the first drill.  Regardless, what gets us closer to that target is warming up (such as jogging), which this article supports. 

The reason we've been taught to stretch is to prevent injuries.  If stretching reduces the power output from my muscles while also reducing the chance that those muscles will get hurt, I would stretch every time, especially before practice.  I have read research pointing in each of three directions: stretching prevents injuries, stretching does not affect injuries, and stretching either causes or increases the chance of injuries.  I have also seen research that says that repetitive extension, such as during active warm ups, can increase the chance of injuries.  I haven't seen conclusive data on either subject, but this article sheds no light on these issues. 

~ Yuriy