Not to fuel speculation, but just reading between the lines on some of Kam's recent tweets, they might have hit a snag:
NFL=Not For Long.... #Truth
luke snitzler@Luke537724 Mar
@Kam_Chancellor kam, can u promise to never leave the Seahawks? Ur my favorite player and I don't want to retire ur jersey
@Luke5377 not my call
The first quote is too out of context to have any idea. If I were to speculate he could easily be talking about the rules changes.
The latter, sounds more to me like him just not wanting to say something that he can't guarantee. Even if he wants to remain a seahawk for life, there are too many variables that aren't in his control.
I wouldn't Interpret either of those as some snag in any negotiations, and even if there are slow moving negotations, that's just par for the course this early in that type of situation. He's going to start high, they will start low, and given he's got a full season, not to mention most of this offseason, both sides could easily be patient with it. It's not really a priority at the moment.
Personally, I believe they will extend him before the season starts, but not necessarily before the draft.