Isaac was the second Penn State edge rusher drafted.
The offensive tackle was the third Nittany Lion selected in this year's draft.
Townley had one tackle during the 2023 season.
James Franklin booked it across Maryland faster than the speed of light.
Fashanu and Robinson's selections mark Franklin's 22nd and 23rd first-round products.
Robinson joined offensive tackle Olu Fashanu as a first-round selection.