Cornerstone Captains mentioned on Stream

[Dolenz_PSN]

I don't know if these have been previously announced but the four Cornerstone captains are

Nolan Arrenado
Byron Buxton
Greg Maddux
Kodai Senga

Arenado's boost is for slow guys (45 speed or below)

You can see a lot of other team captain cards and such as the tourney players choose their teams.