DeLorean was a Visionary in the automotive world. Many of his ideas were ahead of their times.
An example was the OHC Inline 6 Cylinder engine that was used by Pontiac in the late 60's,early 70's. The American auto buying public wasn't that interested in a six at the time when you can get 350 & 400 CI V-8's in a Firebird. Inline six engines were were used in trucks and cheap grocery getter Falcons, Darts, and Novas. But none the less it was a pretty advanced engine for it's day the the public wasn't ready to accept the inline six as a performance engine.
It did not sell well but the OHC inline six became a staple design for BMW, Mercedes, Toyota, Nissan, and Jaguar. They saw the potential of this design and continue to use refined versions of their own inline six designs. They have sold millions of performance cars and have won 1000's of races with inline six engines.
Had DeLorean worked for a Euro company more of his ideas may have made it to production.
RIP John DeLorean