Role of David 8

The more I see the different trailers, the more I think that david plays a major role in the main plot of this film. For example, when he questions -probably Shaw- about what she would be willing to do to have her answers... Or when he looks intently on the little "worm" wriggling on top of an ampule, with a dangerous smile on his face... Or when he looks at the goo at the top of his finger and says that big things have small beginnings... Or the rather disturbing stillness while he stands with a kind of helmet on his face...