Whenever there is more than one mook of the same type, there should be away to identify which of them dropped a particular cd tile so that a player knows which of them to target to remove it.
There is, scroll through the enemies by tapping on them. When you bring a new enemy to the front whatever CDs they own will flash
Sure, if you wanted to do it the easy way. 
I just learned this “trick” last week and took full advantage of it over the weekend. Gone are the days of not knowing which Muscle or Hitman to take out first. This knowledge has made goon nodes so much easier.