Dilione was the fourth transfer to commit to the Nittany Lions.
Lawall previously served as Director of Operations or the 2023 and 2024 editions of Movin' On.
Johnson is pinned as a potential third-round selection in the 2024 NFL Draft.
The Nittany Lions begin their Big Ten Tournament campaign at home on Saturday, April 27.
Owusu's NCAA eligibility was previously uncertain.
The commencement for the college will kick off at 1 p.m. on Saturday, May 4.