3 primarchs are already back, no way to put the genie back in the bottle. and Fulgrim in current lore is rampaging on battlefields, and lorgar has finally stepped out of his tower. Not to mention we know Angron is going to want to make a return on Armageddon.
We know the Lion is sleeping in his tomb in the rock, and the fact that the closet homo's didnt even wake him up when they were nearly going to be exterminated should tell you something.
Vulkan is still waiting for his sons to get their head out of their asses and finish geocaching.
Russ is still stuck in the eye, and Khan is too busy being buttfucked by the Deldar.
the fisters primarch is missing and so is his fist.
We seriously need to get some fucking loyal primarchs to balance out all the chaos whoring going on, because I am getting tired of "guillimen saves the day" all the fucking time. Its worse than the Jacestice League shit going on in MTG.