Arnold is an exciting talent, but Dillon Gabriel is absolutely a substantial loss. He's a proven, high-level starter who's amassed 14,865 yards (at a stellar 8.9 per attempt) with 125 touchdowns to 26 interceptions in college, also running for 1,060 yards and 26 more scores. Gabriel is headed to Oregon for his final year of eligibility.
The biggest departure is safety Key Lawrence, although OU's depth on the offensive line has taken a serious hit. Left guard Cayden Green is in the portal, along with top backup Savion Byrd and reserves Aaryn Parks and Nate Anderson. Rotational running backs Tawee Walker and Marcus Major are leaving Norman. Edge-rusher Reggie Grimes lost his starting job in 2023 but is also worth mentioning.
I have good news and bad news: Oklahoma is thin on NFL-worthy prospects this cycle. Right tackle Tyler Guyton will likely be selected on Day 2 of the 2024 draft. After him, though, center Andrew Raym and wideout Drake Stoops are basically OU's late-round prospects.