They were neck and neck for most of the season but Hulk just stepped it up in the last couple of races.
And i think Di Resta has been struggling a little as the gaps in qualifying have been bigger between them then usual.
Di Resta is a good driver, FI had one of the strongest team-pairings you could get.
Rarely made mistakes and just kept their head cool.
Di Resta is a DTM world champ and he beat Vettel in F3 so he´s a lot better then people give him credit for