There may be one other thing keeping Duran in AAA:
Danny Santana
His opt out was extended into May. I'm not sure anyone knows the exact date.
Santana is off to a red hot start:
.467 OBP
.846 Slg%
1.313 OPS
3 HRs in 26 ABs
If he's ready, he's the next call up, and he can play OF, including CF, SS, 1B, 2B and 3B.
People point to 2019 as an outlier, and it does look like one with 28 HRs in 474 ABs (.857 OPS) and 21 SBs, but he did have a decent rookie year back in 2014 with an .824 OPS and 20 SBs in 24 attempts. He has a career plus UZR/150 at 2B, 3B and LF, but is minus at CF, RF and 1B.
He deserves a first look. When he's deemed ready, I see a Santana- Cordero swap of roles.
When Duran is ready, I'd DFA Brice and call him up.