Take a look at the NCAA Eligibility Center Rules at the following link:
http://www.ncaapublications.com/productdownloads/TGONLINE42016.pdf
On Page 14 it lists the Exception Rules as follows:
FOUR-YEAR TRANSFER GUIDE
TRANSFER EXCEPTIONS FOR DIVISIONS I AND II SCHOOLS
If you transfer from a four-year school to an NCAA Division I or II school, you may use an exception to compete immediately if you meet one of the following conditions:
1.This is your first transfer
2.You return to your first school without participating in sports at the second school
3.Your sport is dropped or is not sponsored at your current school
4. You never have been recruited
5. You have not participated in your sport for two years
Cam may fall under # 4 which states:
4. You have never been recruited
If you have not been recruited by the Division I or II school you plan to attend,
you may use an exception to compete immediately if you meet the following
conditions:
• You have not received an athletics scholarship.
• You have not practiced for more than 14 consecutive days or competed
in intercollegiate sports.
• You have been recruited if a college coach calls you more than once,
contacts you off campus, pays your expenses to visit the campus or, in
Divisions I and II, issues you a National Letter of Intent or a written offer
of financial aid.
Unless I'm missing something, if ALL of these conditions are applicable, it appears that Johnson can play immediately as a walk-on. Pitt denial probably pertains to receiving a scolly. I don't think this is dead yet.