TA will be useful at times, but i wouldn't worry about rip. Ray's pretty much devastated him all year, rip can't get his own shot anymore and our defensive scheme works of picks and screens very well.
Rip isn't the player he was anymore. he's still very good, but i don't worry about him.
As to bron-bron, pierce and poesy get that job, TA isn't big enough, lebron will post him up, something he's very good at vs. smaller defenders.
TA will see limited minutes as a defensive specialist on guys like billups and other bigger guards who drive, which is exactly what doc should be doing.
he can't protect the basketball, and is inconstant on offense. You sit those guys in the playoffs, you can't afford his 3-5 TO's in 10-15 minutes of work. and you must use them sparingly in thier roles. Doc is using tony fine.