Don't you just get them at the end of the op now?
That kind of defeats purpose of comms. They are supposed to be small reward, even if boss didn't drop any loot for you, you still get comms and somehow can progress with your gear. Removal of comms from bosses means that unless you got your drops or done whole Ops(something pugs tend to have issues with, by their very nature), you get absolutely nothing from it, except wasted time and lockout(it's rather hard to find new group to kill only last 2 bosses)
TFB SM bosses also currently don't drop comms.