Matthews and Fatta are doing AA.
Fatta and Roberson have two vaults so they will both do that. I heard Sumanasekera was training a second vault.
The only thing would be who is the 3rd AAer in prelims. Roberson or Sumanasekera. Both are equally bad at bars, which is why Miller is going. You do want Sumanasekera doing beam for sure so it is either Roberson or Miller off that event for her.
VT (Matthews) Roberson, Fatta, Sumanasekera
UB (Roberson/Sumanasekera), Fatta, Matthews, Miller
BB (Miller/Roberson) Fatta, Matthews, Sumanasekera
FX (Fatta), Matthews, Sumanasekera, Roberson
I don’t remember if there are team finals this championships or just the team qualifications in day 1.
Also another potential reason for Roberson being named to the team is that Sumanasekera and Miller are her teammates from WCC.