Old School Coach.
At QB might have something to do with it
Klubnik even went into his senior year as a potential Heisman winner and projected top 10 NFL pick.
Perhaps he wasn't up to his shenanigans then or they kept it under wraps.
But he was a helluva college QB
that he absolutely curb-stomps UNC in a couple weeks
So 2008-2011 he was 29-19 (0.604), with Terry Bowden being on the hook for the other games (3-3).
Dabo overall without Venables: 66-37 (0.641), one playoff appearance (2024) and a BCS bowl loss (playoffs didn't start until 2014).
Clemson with Venables but without Deshaun Watson or Trevor Lawrence starting: 50-12 (0.806), one Orange Bowl (BCS) win pre-playoffs, zero playoff appearances. This includes games with Watson or Lawrence on the team but they didn't start.
Clemson with Venables but no Watson or Lawrence on the team at all (2012, 2013, 2017, 2021): 44-9 (0.830), and the aforementioned Orange Bowl win (2013).
Clemson in games started by either Watson or Lawrence: 66-5 (0.930), 2 national titles and four title game appearances.
Certainly they have been better with BV than without, but I wouldn't say he's the sole reason for their success over the past 10-15 years.
No. 1 seed - that was the gap year between Watson senior year and Lawrence freshman year. They got handled by bama, who was the no. 4 seed, in the semifinal, but they did manage a playoff berth without either of those 2 behind center.