Ok, great, but if I go from terminal B to C (flagship) staying on airside, there really is no immigration from airside? I.e. immigration is only on arrival paths from international flights. Kind of knew that but did not realize as have not flown too much so that there would be any time to go outside.
But, in case I travel airside from B to C, drop bag to flagship (if they had lockers), if I accept the fact that security can be pain, there should not be real issues going landslide, releasing security at C, collecting bag and waiting until departure from D. So simple, what could go wrong.