Okay, the splice i mean is really evident on the Zapruder film, it's i believe on Z154.
I wasn’t sure if you were referring to z208-211. Yes, Life Magazine damaged the emulsion on frames 154, 155, 156, and 157. 154 and 157 are still there showing some damage, but z155 and z156 were spliced out.
If that is true we have been misnumbering the subsequent Zapruder frames ever since. The head shot really occurred at Z315.