Capsular Contracture is most likely caused by biofilm which is the result of bacteria entering the pocket and colonizing the surface of the breast implant. During surgery, most board certified plastic surgeon who specify in aesthetic breast surgery will use what is called a no touch technique which minimizes bacterial inflow to the pocket. Use of antibacterial and irrigations, use of a no touch delivery device, use of antibiotics, change of gloves, and multiple other technical things will minimize the risks of capsular contracture. Even when sterilized sizers are used, a Keller Funnel is always used again minimizing the risks of bacteria entering the pocket. So in answer to your question, when multiple sizers for implants are placed in to the pocket, as long as an antibacterial, no touch technique is utilized, the risks of capsular contracture are not increased.