The key is Castillo - everyone knows about Merriman, but Luis has been a favorite of the coaching staff since he arrived. Remember, Castillo would have been a top 10-15 pick had he not tested positive for steriods before the draft, enabling the Chargers to roll the dice on him at 28.
In the last two years, the Chargers have drafted Shawn Merriman, Luis Castillo, Antonio Cromartie, and Marcus McNeill.Only Merriman was taken near the top ten (number 11 or 12, I forget), but all four of them are top ten talents. The others slipped for other reasons (Castillo steriods, Cromartie knee injury, McNeill back condition). They all look like fantastic picks.