Thanks for the previous answer; I have one last clarification:
Regarding Question 3:
---Question 3: What happens if the chosen opposing dude is aced during the first round of Shootout Plays (by Point Blank or Legendary Holster, e.g.)? Does Stone's ability "fizzle" since I haven't chosen a shooter yet? On the other hand, the ability doesn't say "is aced as a casualty", so I wouldn't think Stone would care how the dude was aced...
The ability remains in play. As you are no longer opposing the dude, your shooter does not get the +2 bullet bonus, but once your shooter is declared, your shooter will receive the permanent +1 bullet bonus and permanent control point.
If the dude aced by the shootout play was the only one in the posse, would the control point and permanent bullet bonus not be awarded then, since the shootout would immediately end before a shooter is chosen in Step 2?