Absent Gingrich, Santorum would beat Romney one-on-one. Absent Santorum, Gingrich would beat Romney one-on-one. Together, they’re giving him the nomination.
Gingrich lost to Romney in the South. Absent Santorum - Romney would have won, not Gingrich.
Gingrich cannot beat Romney in the head to head.
One-on-one is a dead ender to the conservative movement. All coalesce to Romney the socialist who goes on to loses (like Dole) to Obama.
One on one means - Game Over
If not for all 3 in, Myth would already be the nominee. Pray for convention.