Garrett Hampson could be a guy that could replace Story at shortstop or Rodgers at second base as those are his two most natural positions with shortstop being his best and the one he is most experienced at.
He looks to have an edge on the starting center field job for the Rockies, though, as of now. If he were to become the everyday center fielder, the Rockies would replace him in center field with somebody that is more of a natural outfielder, like Sam Hilliard, Yonathan Daza, or even Jameson Hannah, who has been the flavor of the month in spring training for the Rockies thus far.
But, again, like Rodgers, Hampson has to prove that his bat can play at the major league level. No more sub-.250 batting averages or sub-.300 on-base percentages for Hampson. He must take a few steps up offensively to show that he can be a guy to replace Story as the everyday shortstop (or frankly, be the Rockies everyday center fielder).
Alan Trejo, the Rockies 16th round pick in 2017, has played well for the Rockies in spring training at shortstop (and some other infield positions). But he has never played a game at the Triple-A level, let alone at the MLB level.
In 2019 in Double-A Hartford, he only hit .243 with a .290 on-base percentage. So, he would need to play really well in Albuquerque at the start of the minor league season and, frankly, Rodgers and Hampson would have to fall flat or be injured to start the 2021 season.
In other words, Trejo is more of a dark-horse pick to replace Story but someone that still has a chance nonetheless.