Wylie didn't appear in the Blue-White Game last month and was absent during the last few media availability of spring practice.
Gaines committed to Penn State in 2023 before decommitting in March.
Taylor's departure followed five players entering the transfer portal on Thursday.
The announcement came after Parker decommitted freom West Virginia on Monday.
Israel-Achumba joined safety King Mack, wide receiver Malik McClain, and running backs London Montgomery and David Kency Jr. in the portal.
This was McClain's second time entering the portal after transferring to Penn State last year.