There is a lot to unpack there, not all of it accurate.
Hackenberg
Showed up as the top ranked high school quarterback since Andrew Luck. Pure pro-style player. He improved every snap from the moment he arrived until O'Brien left. He regressed in just about every measure after he left despite being the unquestioned MVP of the 14 and 15 seasons and the only reason we didn't fall to 3-9 both years. Forget the constant pressure resulting from John Donovan's refusal to use pure man blocking which our linemen actually did well in the limited time they used it, or the horribly route tree combinations which allowed defensives to defend 3 receivers with 2 players on a regular basis. Delivery, footwork, everything suffered under Rahne and Donovan. Never mind the under-discussed shoulder injury that essentially killed his career. Ricky Rahne was the worst QB coach in Big Ten history by a wide margin.
McSorley
Trace benefited from Franklin running Hack off the roster when paired with JoeMo who wanted to run what LSU ran in 2018 with Hack. As a side note, had Hack stayed, we had better offensive talent across the board than what LSU had in 2018 with Barkley, Godwin, Gesicki and Hamilton. While people fault Trace's performance in 2018, and some blame an injury that only impacted one game, the fact of the matter was with Godwin, Gesicki, and mostly importantly, Barkley and Moorhead gone, he showed who he was. An average dual threat QB. Trace did not regress one bit. He was always the player we say in 2018.
Clifford
Cliff is a different story. Whereas Trace was a glorified option QB, Clifford is more of a pro-style that can run but not a pure prostyle. Hi 2019 was objectively the best season a Penn State QB has produced (while facing the most difficult schedule) since DC in 2009 despite playing with a major drop in skill position talent compared to the previous year with the loss of Hamilton and Sanders. He wasn't a perfect fit for the offense JoeMo left for Trace to run as Rahne lacked the coaching acumen to adjust it to the talent on hand. Then 2020 hit. Rahne leaves, Franklin hires a west coast offense coach who radically changes the offense. New blocking scheme the players can't execute, 2 years of Rahn'e QB coaching that needed to be undone and the offense was a failure. It sort of turned around late when the scrapped the scheme and most reverted to the scheme the ran the previous two. Covid wasn't the reason the offense failed nor did Cliff regress. He had to learn something new while relearning how to play QB. Enter 2021, a new blocking scheme less suitable to the talent on hand than the previous one but Rahne's damage was mostly undone. Until getting hurt, Cliff was fine despite being a roundish peg in a squarish hole. Even then, after he returned, the chinks in the armor discovered throughout the first half of the season, none of which were QB related, doomed the season.
Bottom line, Hack was destroyed by poor coaching, Trace was always the average QB we saw in 2018 and Cliff was yoyoed by constant changes at OC resulting in mixed performance. Bottom line, coaching and recruiting has impacted the QB position more than most, and all it is on Franklin.v