I doubt it mimics regular flour (the gluten+starch combination is pretty hard to imitate in any other single source and usually requires a blend), but I'm personally in the "avoid soy as a general rule" camp, so I don't really have direct experience with it.

You don't need wheat flour like flour to have fried chicken, either. There's some awesome "breading" recipes out there that use things like almond meal or pork rinds, like this one -- http://www.generationyfoodie.com/2013/06/paleo-almond-chicken-fingers.html

I don't know as I avoid soy as well. I generally use almond flour for breading, but have seen recipes for pork rinds and/or grated Parmesan cheese (the kind in the green can) as well.

However, if you have soy flour you want to use, I know George Stella's recipes use it quite a bit http://stellastyle.com/site/recipes. Here is one for Southern Fried Chicken that's made with soy flour: http://stellastyle.com/site/2012/10/30/low-carb-southern-fried-chicken/