It wouldn't matter, however, as the Titans would get another first down to secure the 22-21 win. The two-point conversion attempt failed - and almost brought disaster for the Titans when Mariota was sacked, but officials ruled he was down before the ball came loose.
Kansas City controlled the first half, gaining 264 yards.
The Titans would take advantage, converting a 3rd and 10 and getting a long 35-yard rushing touchdown by Henry, who was simply unstoppable all game.
Mariota, who delivered a key block on Henry's game-clinching run in the fourth quarter, finished with 205 yards and two touchdown passes with one interception.
The Chiefs' suffered a blow when Kelce suffered a concussion late in the first half on a helmet-to-helmet hit from Titans safety Johnathan Cyprien.
With almost six minutes left in the game, the Chiefs still had an opportunity to retake the lead.
Raiders enter offseason waiting for news on Gruden
Del Rio then had an awkward and emotional post game press conference with the media where he addressed his dismissal. After ranking top 10 offensively in points and yards last season, they are 23rd and 19th, respectively, this year.
The Titans wound up rallying for a 19-17 victory.
The ball was deflected, only to be caught by Mariota, who ran in for a score. At the end of the Titans' opening drive of the second half, Mariota attempted pass on third-and-goal from the Chiefs' 6-yard line.
The Chiefs needed a break, and seemed to get it when Peters stripped the ball from Henry; Johnson recovered the ball and ran it back 56 yards. The Titans quarterback snagged it and dove into the end zone to cut Kansas City's lead to 21-10.
Smith is 8 of 11 for 154 yards and the score.
Gruden is providing the color analysis for ESPN's broadcast of the Chiefs-Titans playoff game at Arrowhead Stadium.
The Chiefs, whose offense gained less than 100 yards in the second half, drove into Titan territory on their final possession, but Smith missed Albert Wilson on a fourth-down pass with less than 2 minutes remaining.