The marking system for fireteam members in thermal is more of a distraction than anything for me, but
I have a few ideas to improve it.
-First of all, make it last longer, but only show it on the minimap. That way you still have to look around to find your prey
-Second, Create a scaning system, similar to the 2010 avp game, When the predator scans a fireteam member, he should be able to see all of their weapons/equipment. This would encourage stalking and planning. Though it should only take time to scan your prey on the first scan, every other subsequent look at a fireteam member should automatically display their gear.