The problem here is that we don't know, in any way, how the city loan is dealt with in the Hansen offer, or if it is dealt with.
The loan is not to the Maloofs proper, it is to the team. The Maloofs actually inherited that loan when they bought the team and under normal circumstances it would stay with the team upon the sale. So I find it difficult to believe that the Hansen sale would be structured in such a way that the Maloofs, and not Hansen, are the ones who are forced to pay off the loan if the team moves to Seattle.
My default assumption is that Hansen will be on the hook for that loan, and that therefore there is no net $70M in the bargain for a local group.
However, it is possible that Hansen's "real" bid is for the controlling shares is $241M, which would put the full value of the team at $371M - for a team that is not debt-free. To be honest, that's probably a more realistic view of the value of the team. Hansen would be on the hook for $70M in debt, and an estimated $30M relocation fee, so the total cost would be $341M. But, to make it look like the total valuation of the franchise is higher (whoa, $525M!!), Hansen might toss that $100M into the bid for the team on the condition that the sale is not final until after the Maloofs move the team to Seattle. Let us note that the Maloofs, not Hansen, filed for relocation a while ago. So, the Maloofs have to pay the estimated $30M relocation fee (and hence the non-refundable $30M pre-payment from Hansen) and also have to pay off the loan because it comes due when they own the team. Then the sale becomes final and they net $241M.
If the deal is structured like that - done in a way to absolutely maximize the apparent value of the franchise by shifting non-ownership costs into the team valuation - then there's a great argument that the Mastrov bid doesn't need to be as high as the Hansen bid. If Mastrov were willing to accept the city loan as a part of the team (obviously it won't come due immediately if the Kings stay at STA while a new arena is being built), then a bid that is $100M short is actually the same thing.
The big thing, we have absolutely no idea whether the Hansen offer is in fact structured like that. It makes some sense, but it's pure speculation and I'd lean against this being the true explanation.
If, on the other hand, Hansen planned to deal with the city loan and relocation on his own, then there's no bargain to be had for local owners. In that case, any amount less than $341M (or any amount less than $311M if the non-refundable money that Hansen deposited truly is non-refundable and the Maloofs keep it) would potentially constitute real damages to the Maloofs and give them standing to file an anti-trust lawsuit if the NBA ruled against them. And if the NBA loses that lawsuit, they have to pay treble damages. So if Mastrov comes in at $337M, the Maloofs could potentially sue and win $12M from the league. The league would
definitely have to consider that when making a decision.
In the end, I'm a bit uncomfortable about the Mastrov bid reportedly coming in under the Hansen bid, but let's wait to see how it plays out. But if the Mastrov bid comes in at $241M, I think we know exactly what is going on.