Assuming everyone's healthy,
4-3 Base:
DE -- Taylor
DT -- Bowens
DT -- Chester
DE -- Carter
OLB -- Seau
MLB -- Thomas
OLB -- Spragan
4-3 Passing Downs:
DE -- Taylor
DT -- Carter
DT -- Holliday
DE -- Roth or D. Bowens (whoever wins the job)
OLB -- Seau
MLB -- Thomas
(5 DBs minimum, so no other LB)
3-4:
DE -- Holliday
DT -- Chester
DE -- Carter
OLB -- Taylor
ILB -- Seau (possibly Crowder on running downs and Seau on passing downs)
ILB -- Thomas
OLB -- Roth or D. Bowens (whoever wins the job)
4-3 Base:
DE -- Taylor
DT -- Bowens
DT -- Chester
DE -- Carter
OLB -- Seau
MLB -- Thomas
OLB -- Spragan
4-3 Passing Downs:
DE -- Taylor
DT -- Carter
DT -- Holliday
DE -- Roth or D. Bowens (whoever wins the job)
OLB -- Seau
MLB -- Thomas
(5 DBs minimum, so no other LB)
3-4:
DE -- Holliday
DT -- Chester
DE -- Carter
OLB -- Taylor
ILB -- Seau (possibly Crowder on running downs and Seau on passing downs)
ILB -- Thomas
OLB -- Roth or D. Bowens (whoever wins the job)