I guess the real thing is what you mean by step up...
I mean someone who'll lead by performance example. Notching up their own game significantly over what they've been doing lately, or performing at a consistently high level. Whether that's by scoring, assisting, stealing, rebounding, or all 4! Giving teammates opportunities to perform too. Inspiring them, I s'pose.
AND motivate the rest of his team by encouraging them and demanding effort or challenging them.
Someone showing intensity.