With other Rhacs, like Cresteds, the genetics do not work like leos, fat tails and other genetically predictable species. You could end up with half and half, you could end up with all striped, you could end up with all reticulated, or just a random mix! Thats how it works in cresteds anyway and i was under the impression that gargs are fairly similar. Obvs. they have less morphs than cresteds so your probablities would be easier to work out but just wait and see!! you're more likely to get offspring similar to parents but the frequencies are random in cresteds.
Oh and good luck i just love little garg hatchlings! I go crazy for the reallllly pale ones!