Think about this... If the Sacramento group "matched" the Seattle offer by offering the Clowns $312M (which is $1M more, by the way), for their 65% of the team, AND separately reimbursing Hansen for his "lost" $30M, then this means that the Sacramento "valuation" is at $480M.
This could be what's causing all this "discrepancy". But, in effect, the Clowns get the same amount of money ($1M more), and Hansen is made whole. Thus, Sacramento's offer at a $480M valuation is better than Hansen's offer at $525M.
So don't believe the hype. These guys know what they're doing.