"The rebels are alerted to our presence, Admiral Ozzel came out of lightspeed to close to the system."
Why was Ozzel wrong in doing this??? Seems to me the best tactic was to come out of hyperspace practically on top of the rebel base giving them less chance to react properly. If Ozzel came out of lightspeed at the edge of the sytem surely the rebels would be able to detect a fleet of Stardestroyers and a Super Stardestroyer sneeking up on them.
Riekan says that with all the meteor activity it would be difficult to spot approaching ships, but surely you'd be able to detect a fleet of Star Destroyers no matter what...