Local TV stations reported that some employees and guests also joined the terrorists. Were hoarding ammo in the hotels for weeks?
With the remaining terrorist in the Taj and the 7 reported killed in the Taj, that's at least 8 terrorists attacking the Taj alone. You might be right on some prestaging and sleepers being placed inside the Hotel.
It appears to have been an extremely complex operation.
But that’s good - for the good guys. There will be more threads to unravel. The bad thing is that most preliminary clues point towards Pakistan wittingly or unwittingly acting as base for the terrorists.