If i'm not mistaken Red eye is one of most underused mercs. I do believe the main reason is lack of utility of his smoke. His problem is that it blocks the vision not of enemy team, but your team too. No other merc will make real use of his smoke neither charge with Dreiss-RE in close fight nor snipe with PDP-RE in long range ect.
I suggest to improve his spotting ability to let your team see enemy through smoke.
You know mercs get blue&red(dark blue&yellow for spectrators) glowing? I suggest to add similiar glowing that could be seen through smoke. Basicly if you see directly the target with IR googles or SNITCH your team will see basic profile of enemy. This will let your team know what targets can be shot and what targets are hidden behind cover - that's much more usefull data than simple icon above enemy head.
This would let RE to work better with team. Specificly Red eye and Aimee would benefit from working together. Let you counter enemy Red eye with your own Red eye or Aimee. Simply killing RE in this case would be better priority because it would leave enemy same blind in smoke.
Another intersting thing is Hunter's ability. It seems that he can disable Phantom's armour. It would be interesting if Hunter's EMP also disabled RE's googles making Hunter to shoot emp in smoke to make RE blind.