Unless I am seeing it wrong, I am going to have to disagree with you on that one. I use malice clips on a number of personal gear and they tend to hold a pouch or piece relatively tight to the vest, pack, or whatever. With Royce shell panels, it appears they are held only at the top and bottom, with nothing pulling them in to the vest in the middle. Using a malice clip properly would hold the middle in to the vest as well, especially since the shell panel has a cross web in the middle.
I believe the shell panels are attached very poorly with something like zip ties. That is certainly not idea and malice clips would do an infinitely better job, but I just don't feel like that is what is being used when I look at the screencaps. I could, of course, be wrong.