Don't forget that this show will be based on a very well established (read old) comic entity. Nick Fury has been around since WWII.
But Phil Coulson has only been around since 2008. Let's face it, this is really the Coulson spinoff that Clark Gregg's fans have wanted for years. Fury will at most have the occasional cameo or name drop. (Samuel L. Jackson has said he'd be willing to do it like Charlie on Charlie's Angels
, just be the voice giving orders over the phone.)
True, the show's creator credits include Lee and Kirby, but they're being credited because of their creation of the S.H.I.E.L.D. agency itself in Strange Tales