Brands position should be (and almost certainly is) broader than simply overseeing the first team and manager. Brands should be overseeing the U23s and the academy as well, and as such the work of Unsworth and Dobson et al.
However, when it comes to first team matters, Silva should be (and likely is) the most important person, whilst Brands is the most important person when it comes to overseeing the football side of the club as a whole.
From Brands comments about there being no point in him signing a player that Silva won't play, it would suggest that this is the case, in contrast to when Spurs and the RS first started playing with the DoF, where they signed players that the manager didn't want or need.