The epic and breathtaking Bills loss in Kansas City — an instant playoff classic — opened the door for the Giants to pounce on Brian Daboll, and they are doing exactly that.

The Giants on Tuesday will interview Daboll, the Bills’ offensive coordinator, for a second time — this time in person at the Giants’ facility — as the movement and momentum continues to connect him with the Giants’ vacant head-coaching position.

If the Bills had advanced into the AFC Championship game, the Giants could not have met with Daboll a second time until at least a week before the Feb. 13 Super Bowl. Daboll and his quarterback, Josh Allen, were brilliant in Sunday’s divisional playoff battle but Patrick Mahomes and the Chiefs got the ball last and captured a 42-36 overtime thriller that goes down as one of the best postseason games in NFL history.

That massive disappointment for Daboll pivots into a huge opportunity for him. He took a day to unwind from such an exhausting emotional expenditure — the Bills were 13 seconds away from winning in regulation — to prepare for what figures to be an intense and lengthy presentation to the Giants.

The Giants fired Joe Judge two days after a 4-13 season and Daboll’s name immediately surfaced as a candidate. Joe Schoen, the former Bills assistant general manager, was hired Friday by the Giants and the new general manager immediately reached out and secured an interview that night, via teleconference, with Daboll. A day later, Schoen and co-owners John Mara and Steve Tisch met via teleconference with Leslie Frazier, the Bills’ defensive coordinator.

On Sunday, the Giants held a teleconference interview with Lou Anarumo, the Bengals’ defensive coordinator — and, in 2018, the Giants’ defensive backs coach, working on Pat Shurmur’s staff. On Monday, the Giants held their first in-person interview at their facility, with Dan Quinn, the Cowboys’ defensive coordinator. Quinn met with Schoen, Mara, Tisch and also Chris Mara, the Giants’ senior vice president of player personnel.

Patrick Graham, still under contract as the Giants’ defensive coordinator will interview in person on Wednesday. And Brian Flores, fired after the season by the Dolphins, will meet face-to-face with Schoen and company on Thursday. Flores, Quinn and Frazier are the Giants’ candidates with previous head-coaching experience. Flores went 24-25 (no playoff appearances) in three years with the Dolphins. Quinn went 43-42 (two playoff appearances) in five-plus seasons with the Falcons. Frazier went 21-32-1 (one playoff appearance) in four seasons with the Vikings.

Quinn grew up a Giants fan in Morristown, N.J. — he had a poster of Lawrence Taylor on his bedroom wall — and he could have options in case things do not work out with the hometown Giants. The Broncos are bringing Quinn in for a second interview and he is also considered a strong contender for the Bears’ head-coach job.

One game should not dramatically change opinions, but there is no doubt Daboll’s role this weekend in the scoring-fest, filled with sensational highlights from Allen, enhanced, if not his chances to land a head coaching job, certainly his reputation as a play-caller. He has already interviewed with the Dolphins and a source said it is likely Daboll will have options, as far as picking and choosing from more than one offer.

The Schoen-Daboll link is a strong one from their four years together in Buffalo. That Daboll is an offensive mind, working well with quarterbacks, is a plus, considering the sad state of the Giants’ offense and the need for Daniel Jones to develop into a more capable starter. Daboll, 46, has Bill Belichick/Patriots roots and has also been an offensive coordinator for the Browns, Dolphins and Chiefs in the NFL and for one year working for Nick Saban at Alabama.

The Giants, in accordance with the Rooney Rule, must have at least one in-person interview with a minority candidate from outside their organization, so there cannot be a rush into a union with Daboll. He is the only one of the six identified candidates with a background on offense, which is surprising, and the first known finalist, the first to be called back for a second interview. It is premature to call it Daboll’s job to lose, but all signs point to him as the front-runner, at this point, before he sits down and makes his pitch in-person.