In our district, GT is not a pull-out so when DS SSA in 2nd grade, he went into the 3rd grade GT math, which compacted 3rd and 4th grade math. In fact, among the extensive paperwork generated, it was clearly stated that a student may not SSA unless it was into the next level GT class. This makes sense since GT is one grade level above (4th grade covers 5th grade plus some challenges, 5th grade covers 6th grade plus some challenges, etc.) and if that was all the student needed then the standard GT class would work. Since your school separates acceleration from enrichment, there is no reason why your DS should not have access to both after a reasonable trial period of say a few weeks, to give the school confidence that he can go into the higher level pull-out.