1952: Robert Taft
1960: JFK
1968: Election gets Thrown Into House, where Humphrey Wins
1976: Henry Jackson
1980: George HW Bush(Unless some other major Republican who didnt run due to Reagan being viewed as inevitable ran)
1988: Bob Dole
1992: Jerry Brown (But Election possibly gets thrown to the House)
2000: John McCain
2008: Hillary Clinton
2016: John Kasich(I think without Trump in the race he dominates the Midwestern and the North East Primaries and Rubio still implodes at the NH debate)
I doubt Kasich would have won the nomination. Ted Cruz would have been the nominee if Trump stayed out.
1976 was with an incumbent, btw.
you said non incumbent winner and Ford Lost
There is almost no way I see Ted Cruz getting the nomination as he would do terribly in the Midwest, North East where there are many winner take all states , Florida(another winner take all) , Virginia , North Carolina and the West Coast(California is basically winner take all). The GOP primary map to the nomination is actually very unfavorable to candidates like Cruz.
There were only 3 other people I could see win the Nomination other than Trump: Kasich, Walker or Rubio. Walker flammed out quickly and Rubio imploded at the hands of Christe, not Trump.