If, God forbid, Pitt lost Trey or X and lost out, Capel would still get those players back plus they'd have the difference makers of the 2019 and 2020 classes. There's plenty about Capel that's worth keeping. Stallings was doomed because he took a huge class, half of which lacked the potential to even play reserve minutes in the ACC.
His 8 man recruiting class:
4 non-P5 players (Peace, Samson, Parker, and Malik)
1 borderline starter (TB)
1 pretty good reserve-type player (JWF)
1 good player (Carr)
1 ???? (Shamiel)
Plus, as up and down as it's been at times (I'm still encouraged), Pitt has mostly been in every game under Capel. Stallings lost to Navy and Montana, plus 30 point losses to Penn State, Miami, Duke, UVA, Clemson (!!!!!), and Louisville, a 40 point loss to UNC, and a 50 point loss to Louisville.
We were literally unwatchable under Stallings. It was a horror show without any promise of better days.