IndyCar's five-year technical plan was always going to be measured by its success in luring in a manufacturer. By all accounts, it came close to enticing the Fiat Chrysler Automobiles-owned Alfa Romeo into the series and securing that all-important third brand to join Honda and Chevrolet.
But the retirement and then death of Sergio Marchionne put that move on ice and IndyCar continued to mull its future with Honda, Chevrolet and outside manufacturers. As recently as last summer, IndyCar president Jay Frye went from one major carmaker to another for "positive talks" as the chase of a third brand became an increasing priority for the series.
The difference this time compared to such missions in the past was that IndyCar was coming in from a position of strength. Back in 2012, Chevrolet had to take what it had described as a "leap of faith" to join Honda in the series as an engine manufacturer, while the ill-fated Lotus project unravelled before being abandoned.