I don't think it would be wise to start all 3 of the G's considering the Kings don't have a ton of offense runners right now. Maybe Mitchell but that length of Harkless/Holiday has been good. Harkless isn't as good at getting over screens but this allows them to switch, which they need to do more of instead of sitting back and dropping. They have length to help over at the rim finally, they aren't the small midget team they were just a few weeks ago.
I think the Holiday/Harkless and Mitchell/DDV plan is going to keep working pretty well for this season. Start the wing-span bros, close with Mitchell/DDV as we ramp up his minutes.