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Kobe Bryant, Pau Gasol and Andrew Bynum are great players, but the Lakers have an unhealthy reliance on their top three scorers.
Those three represent 68 percent of LA's per-game point production. All three of the top scorers average over 16 points per game; no other Laker averages even half that.
The only team than can succeed with such a heavy weight on three players is the Miami Heat, who coincidentally also get 68 percent of their scoring from their big three.
If Gilbert Arenas joins the Lakers, he immediately gives them a fourth player capable of pouring in 25-plus points on any given night.
That forces defenses to game plan for another option, and opens up opportunities for Bryant, Bynum and Gasol.