Not sure what you're trying to say for ur first speculation bullet but this is what i have gathered from the videos that I've seen. I assume that the Recon perk shows the enemy who was hit for both you and your team. This is shown in the following video:
This is shown around 0:43 of the video. The video shows that the player is using Extreme Conditioning, Hardline, and Marksman. If you lwatch the minimap, you can see a red dot moving but there isn't a UAV or Advance UAV up. I am assuming that the red dot was caused from an ally using the Recon perk. I'm not sure about how long the perk last but it is shown that it does end after a certain amount of time. Hope this helps out with what you're trying to find out.