"ex con bro teaches geeky younger bro the art of the heist, but when the ex con bro is killed in heist and geeky bro must find the courage to save the day?"
Hmm, do I sense the makings of a logline? A seed of a plot?
IMHO, a good logline triggers the imagination. Maybe not with same story ideas you have in mind. But it gets other minds cooking with ideas and curious to know what you've come up with.
The above, more than any other variation you've posted to date, gets my mind cooking.
I think you have the basic ingredients -- now to figure out a winning recipe and bake the cake.
So keep cooking the concept and if a recipe flops, well, one of my favorite writing quotes is from John Lasseter, executive producer of most of Pixars 'flops': "Be wrong as fast as you can."
Regards and best wishes.