Toby is in the A-team to help the girls:
“I think you’re the one who needs protection” (Toby to Spencer)
"I’m exactly where I need to be" (Toby)
"Toby and Caleb are going to go above and beyond to help the girls find out who ‘A’ is" (Troian)
“Toby and Caleb get more involved in helping the Girls find out about -A” (Tyler)
I will always have faith in Toby. No matter what.
So for the people who think that Toby has been a part of the A-team since the beginning: