The big difference is the level of competition that Fuaga & Hergel went against in College.
The played at Power 5 Conferences... much more NFL ready competition.
It was always going to take Penning longer to adjust to the NFL.
Hergel started at North Dakota then transferred to Texas St where he played 2 seasons . then as a 5th yr SR, he transferred to Boston College . You might want to readjust that since he only played at BC for 1 yr