I would not call it a hardcore bias but there is a certain trend of unacceptability. The major problem with the deobandi approach is that they have a happy picture of the four madhabs. Mostly they are under the impression that the four madhabs are on the same page and they Imams have just disagreed in a few fiqh related issues. They concept propagated is that all the four are Ahli sunnah wal jamaat and the Salafis are the strangers in the town. It takes a good amount of time for them to realize that Salfis are an tributary of the Hanbalis and they Hanbalis have differed in Aqeedah from the Ashartites and maturidis through out the history. It takes a further good amount of time to absorb this fact. The usual reaction is "They have ruined the madhab of Imam Ahmad and now folks like Abu Ja'ffar Al Hanbali are going to resurrect the real Hanbali madhab".