With the coming of Javelin and new guns, I thought we need new awesome pistols and someone to use them well.
He's the brother of Bushwhacker a Texan Cowboy.
New pistols can be some automatic pistols.
Dual pistols (existing ones or new)
He could use an ability to lock people in place like a net gun, bolas or a cowboy lasso. (but I think to be viable in DB it need to be fast)
The main thing here is really the ability of a merc to use Dual Pistols. Dual Deagles (DE .50) or Smjüth & Whetsman .40 anyone?