It’s been a week since Mike Macdonald was named the Seahawks’ coach, replacing Pete Carroll. But the work of putting together the rest of the post-Carroll coaching staff remains. Here’s an attempt to answer some key questions about where things stand. Which positions have been filled?As context, there are no rules on how many coaches an NFL team can have. The Seahawks this season had 23 assistants and five people on the strength and conditioning staff. The Seahawks have filled four spots. One is a holdover — Karl Scott, who had been part of Carroll’s staff the past two seasons and last year he…