I think it’s fair to say that the Seattle Seahawks do not have a particularly illustrious history of tight ends. In fact they’re the only franchise whose all-time leader in receptions by a tight end is below 200.
In the Russell Wilson era, Seattle has essentially not had a starting tight end for longer than three seasons. Zach Miller was TE1 from 2012 through the early part of 2014 before what was effectively a career-ending injury. Jimmy Graham was the guy from 2015-2017 and he cost quite a bit to acquire. Even if you viewed the Graham trade as a net negative, he has all of Seattle’s TE records in catches, yards, and touchdowns.