1. the list of equipment to be recovered also includes some of the TCAS brains as they may contain some data of interest, not just ATC tapes/strips, CVR and DFDR. The maintenance QAR as well, if available.
2. Remember that with both aircraft on GPS navigation you have increased the lateral overlap, and with Reduced Vertical Separation Minimum, you have increased the vertical overlap.
3. The mid-air geometry does not matter much if you have two perfectly serviceable aircraft hitting one another at high speed.