This is a joke. Everyone knows that the stock value would be assessed by a disinterested witness.
At the time this happened, Mitt determined the value was less and probably was, Stemberg was puffing the price to effect a sale, he envisioned (ego) that his company had worth when it didn't, not under his management.
Mitt then turned the company into a profitable company, which could not have been forseen at the time of the divorce. Only a dream & hope for his investment at that time. Buy low, sell high is everyone's dream, just don't always turn out that way.
Nothing in this that will harm Mitt and don't look like he is afraid. Greedy EX and shark.