There were other factors in the game, but for those downplaying the massive impact pressure on the QB had in the ND / Clemson game; here's a pretty good snippet on the vast differences in Baker Mayfield's season once QB pressure was reduced.
"... 2. Mayfield is getting pressured way less frequently. Owing in part to the tackle change and in part to Mayfield growing more comfortable in the pocket, the Browns have given Mayfield far more time to work with since Kitchens took over. Before the coaching change, Mayfield was pressured on 30.7 percent of his dropbacks, which was the 13th-highest rate among qualifying passers. Since Week 9, though, Mayfield's pressure rate is down to 20.3 percent, which is 31st among 33 passers. Only Drew Brees and Ben Roethlisberger are bothered less frequently. Mayfield has been sacked just once in his past four games. On those rare occasions in which he has been pressured, he has posted an 88.9 Total QBR, up from 16.3 under Haley and Jackson. ..."
Yards are the same but almost every other stat is drastically improved.
SPLIT CMP ATT CMP% YDS Y/ATT TD INT RATING
w/ Haley 130 223 58.3% 1,471 6.6 8 6 78.9
w/ Kitchens 112 153 73.2% 1,406 9.2 11 4 114.4
Link: http://www.espn.com/nfl/story/_/id/25518645/nfl-rookie-quarterback-progress-reports-2018-draft-picks-shown-far