You ask great questions, let's see if these few thoughts may be of some aid in your decision-making:

- A school's goal is typically NOT to identify a person as gifted, but rather to make a match between available levels of educational challenge and the needs of the pupil.

- Schools typically differ in their gifted-challenge-level educational offerings (if any). Therefore when changing schools, a student's placement may differ.

- What did the prior school offer/provide as their gifted-level ELA program?

- What does the current school offer/provide as their gifted-level ELA program?

- Does the current school's offering for mainstream ELA more closely resemble the prior school's offering for gifted-level ELA?

- How close were your child's scores to the cut-off for the current school's qualification for gifted-level ELA?

These old posts may also be of interest:
1) Meeting a student's need for academic challenge -
http://giftedissues.davidsongifted....Re_what_kids_don_t_learn.html#Post233062
2) Meeting a student's need for intellectual peers -
http://giftedissues.davidsongifted....icle_about_poor_school_f.html#Post229604
3) Crowd-sourced tips for parental advocacy to meet their student's educational needs -
http://giftedissues.davidsongifted....y_Advocacy_as_a_Non_Newt.html#Post183916