These are the top G5 schools that be in the super league because of their success on the field and could be part of the P4.

Memphis
USF
UTSA
Tulane

All out of the AAC.

CUSA none that would be safe.

UConn.

Toledo out of the MAC.

Air Force
Boise State
Fresno State
San Diego State
Utah State
Wyoming
All out of the MWC.

Washington State
Oregon State

App. State
Coastal Carolina
JMU
Marshall
Troy
Out of the SBC.

Montana
Montana State
Out of the Big Sky.

North Dakota State
South Dakota State out of the MVFC.

Next tier that could be safe or move down depending on the record.
ECU
Temple
Army
Navy
Mid. Tenn. State
UTEP
W. Kentucky
Colorado State
UNR
UNLV
ODU
Northern Iowa

Next tier knocking into the next tier.
UAB
North Texas
Rice
Delaware
Jacksonville State
Kennisaw State
Liberty
Bowling Green
Central Michigan
Miami
Northern Illinois
Ohio U.
Buffalo
Western Michigan
Georgia Southern
Georgia State
Arkansas State
La.-Lafayette
S. Miss.
Texas State
EWU
Idaho
Northern Arizona
Sacramento State
UC-Davis
Weber State
Albany
New Hampshire
NC A&T
Towson
William and Mary
Indiana State
Illinois State
Southern Illinois
Youngstown State
Chattanooga
East Tenn State
Mercer
UCA
EKU
Tarleton State
West Texas A&M (very strong school in all three money sports)

The rest of FBS is in the lower tier plus these schools.
Stony Brook
Missouri State
Tenn. State
Dayton
Lamar
McNeese State
Florida A&M
Jackson State
Southern U.
Texas Southern
ACU
Austin Peay State
North Alabama
S. Utah
SFAU
Utah Tech
West Georgia
Villanova
Richmond

D2 schools.
Fayetteville State
Virginia State
UNC-Pembroke
Arkansas Tech
Valdosta State
West Florida
Angelo State
Midwestern State
UTPB
Central Missouri
Central Oklahoma
Fort Hays State
NW Missouri State
Minn. State-Mankato
Minn. Duluth
Grand Valley State
West Chester
Colo Mesa
Colo. Mines
CSU-Pueblo

Then you can move teams down to FCS who are losing. Some FCS schools move down to D2.

This is based on their history and record. Yes, West Texas A&M have history as they won the conference championship in football at the D1 level in the Border and MVC. West Chester used to be a D1 program. I have schools like Central Oklahoma in because they could renew rivalries with Tulsa and Oklahoma State.