If this is your position, then perhaps you also agree with me in suggesting that you appear to assume from go that IH would not deal squarely with Rossi.
In IH's mind, they have always negotiated in good faith. That means, get the most favorable deal possible without jeopardizing the deal. This is what each side does during a contract negotiation. IH had better lawyers than Rossi from the start, period. The contract is heavily weighted toward IH.
The biggest coup was that after the second installment, IH had everything. This was in the contract from the start, and there is no doubt in my mind that IH understood the implications of that part of the deal. There was a total risk of zero of not performing according to the contract subsequent to the payment of the second installment, and receipt of information from Rossi. Zero. Okay, maybe the risk of a pesky little dispute. But they even acted shocked and surprised that Rossi had the gumption to file suit.
If a person (or company) is not induced to spend $89 million, they won't spend it. It was a fundamental weakness in the contract that disfavored Rossi. And IH (or at least their lawyers) knew this from the get go, because they likely drafted those clauses.