When it came to the part where the initiates had to jump off a cliff into a hole in the ground (which held a net to the entrance of the Dauntless compound), and this is after they all jumped off the train, Tris was the first to jump and she was Abnegation which Four himself said was 'unheard of'.
When this happened, why did no one suspect that Tris was Divergent, not everyone (especially Christina who was a Candor) would have taken that bravery to make the first jump.
Four (Tobias) found out after Tris had smashed the glass box entrapping her in an illusion and realised she was, Tori found out during the aptitude, I know that Eric realised later during Intiation, but why did no one suspect when she was the first jumper?