It's because the Belgian media created an image of KDB as the new messiah of the NT. The majority of Belgian posters that joined in 2013 are KDB fans, not Chelsea fans.
They probably haven't even seen his games for Chelsea. I don't think you'll see such a fuss over Hazard if he gets benched. He's not Flemish afterall.
Could you tell me why Belgian media and fans seem to care more about KDB than Hazard? Even put last year's performances aside, Hazard's price tag should indicate him being more highly rated and should inspire higher expectations than KDB, if anything, no?