rotor hat

I am going down a rabbit hole with the Type 3 Brembo rotors 380x32 front for my 2013 GT500 caliper swap on my 2013 Boss 302 LS and am hoping for a greater explanation of why I have been repeatedly told that Brembo Type 3 rotors cannot use custom hats and work with the OEM '13-'14 GT500 calipers...