You may be right but there have been pre-order exclusives in the past that then became public in past CoDs. Like Nuketown 2025 in BO2.
Ghosts seems to have many exclusive items from pre-ordering from different retailers and monster energy prizes . Character customizations, weapon camos, patches, and backgrounds. Even the clan wars have these items that can't be obtained by all players.
So unlike many CoDs in the past, it most likely won't be possible to unlock everything the game has to offer.
But to answer your question....I don't know.