I predict Duran & Houck start the season in AAA.
Houck has the better chance at beginning the season in the bigs, due to Sale being on the 60 day IL and the fragility of 3 other starters, but even if Houck does start in the bigs, my guess is, he will be sent down for enough time to gain a year of control AND to limit his IP, this year, which should be part of any plan, as it is.
Duran's best hope is that Cordero flops or gets hurt, but even if he does, we have Marwin, EHern and Chavis who can play OF and Arroyo, Marwin or Chavis to play 2B, if EHern plays OF.
I may be over hyping the team control aspect of the choices, but there are several other valid reasons to keep both in the minors for significant periods of the 2021 season.
Again, Houck's IP will surely be limited, so why not do that by sending him to AAA for a period of time?
Duran is still learning the OF position. He's just made a major adjustment to his hitting approach. He has not produced good numbers at a high level of the minors for any significant period of time. We have 6 guys out of our 13 everyday players that can play OF without Duran with maybe EHern being the best of the 6 on defense not even being slated to play the OF on opening day.