Spurs are a title chasing team, with one of the best strikers in the world. If anything they will buy another ready-made world class striker to supplement (llorente already?), there's no danger here on Davis.
Onamah is surpluses to requirements, they have; Alli, Erikisen, Winks, Deir, Dembele, Lamela, Benteleb all ahead of him for the CM & CAM. We will either buy him if we get promoted, or he will get sold for a nice english-driven transfer fee.