The zone is not a matter or whoever lives closer to the high school area. Lottery is one way. The other way is first come first serve.
If you go to grab the new house price sheet from the builder in Pacific Highland Ranch, Manzanita Trail or Carriage Run, they mention no guarantee for your kids in Torrey Pine High School.
My friend put deposite in Manzanita Trail and after a week they dropped, and moved to 4S. CV school is attractive for the buyer even it is high in MR and HOA. People are still willing to move there. If no guarantee for the Torrey Pine high school, Poway school distirct is good option.