Is it a red flag to watch out for if a PS does not have any pics of explant without replacement? That's the procedure I need

Thank you for addressing the issue of B/A photographs.
You should select your surgeon based on his professional credentials and how comfortable you are with his consultation and advice.  In addition, your surgeon should only perform surgery at an accredited surgical facility with hospital admitting privileges.  If the physician satisfied the above criteria, I would feel comfortable proceeding with surgery.
B/A photographs are a useful tool in illustrating what a surgical result may look like.  Showing B/A photographs requires the patient consent to the use of their photographs and not all clients agree to the use of their pictures.  Patient privacy matters are protected by HIPPA -- a Federal Law.  This is one of many reasons your surgeon may not be able to show B/As.   
In our practice, we consider it a distinct privilege to be able to use patient photographs and we only show a very limited number of photographs.  Keep in mind, B/As do not guarantee results and most practices have an active disclaimer to this effect.
 

 Thank you for your question. Not having photos of explanted implants is not uncommon. The reason is that most explant patients had a different implant surgeon. The surgeon removing the implant cannot guarantee your post operative size or shape due to the fact that he/she has no idea what your starting breast size or shape was.  If you have any concerns, I recommend speaking with your plastic surgeon. If you are still uncomfortable I recommend a second opinion. But not having photos should not deter you if you are comfortable with your surgeons ability. Best of luck with your surgery.