Question

Evidence that Dallas Winston could do anything

Answer 1

The rough, rugged and haunted Dallas fascinates Pony. Even before Pony becomes an ace storyteller, Dallas acts as his muse, or inspiration. Pony says,
I used to like to draw his picture when he was in a dangerous mood, for then, I could get his personality down in a few lines. (1.46)
Notice the "used to." This is some subtle foreshadowing. Pony no longer sketches Dally because Dally's already dead when Pony's writing. His death is one of his reasons Pony's writing this piece in the first place