Flowering - one more developed than other

What reasons would contribute to one OUTDOORS largish plant (4-5ft) showing only a couple of pistils at bud sites where as another much much smaller plant (1 ft) shows more developed flowers (little 1-2 cm clusters of pistils/buds) whre they are both in the same location recieving basically the same amount of sunlight?

Nutrient issue?

Factor of size?

Some mature at a faster rate especially if they were showing in preflower. Mine are doing the same thing. They are all in the same grow room and all the same age but all three are in adifferent stage of flowering. The one that is the furthest along was heavey with pistols in preflower while the next one was only showing a few on the main stem and the least developed didn't have but maybe 2 or 3 pistols on the whole plant. Today is the start of week 2 and they are definatly in different stages. Just remember to check your tric's before you harvest them.....