I think the one true indication of real race car engineering genius is to be disqualified - sorry Adrian Newey and Gordon Murray (Murray's BT46B was blatant theft of the idea behind Jim Hall's Chaparral 2J). It's interesting to be reminded of how similar the competitor's objections to genius was. In the case of Chapman's 88 and Hall's 2J was that everybody would have to adopt the new technology at great cost (thank goodness the cost of F1 has been restrained!). In the case of the 2J, it was even argued, by McLaren (!), that Chaparral would end up dominating Can Am and ruin the series (this, after McLaren had won the virtually all of the previous twenty Can Ams!).
It's turning out that 2020, and January 2020 in particular, will be big for auto auctions! Chapman's 88 and the one remaining genuine Bullitt Mustang both go on the block in January!