
Merry Christmas, What size is your tank?
The two things that come to mind. #1 You will displace water with gravel when you put it in. (you might overflow the tank)
#2 Even with the most thorough washing of the gravel, to put it in the way you are talking about will stir up sediment, and cloud the water. Not a major problem, it would just be frustrating.
My question is why? Since to "cycle" you are trying to grow bacteria colonies on gravel, decorations, and in the filter. It seems like you need all of these to be in place for the bacteria, before you try to cycle. But in the end it is your call, and if you just can't wait........