It's because the former (whilst having holes in their game), can be schemed around. As mentioned ad nauseam Dak's weakness is his composure (when trailing) which appears to permeate throughout the team, when your Talisman is having a 'Composure Moment'.
How do we build a Defense that's good enough to keep us in the game, whilst Dak finds himself (especially as some may argue in the 2 x SF loses, even with manageable deficits, he still comes up short ....in the biggest games)?......probably need Dak to concede on the length of contract to allow severe restructuring opportunities.