We have some chicks right now that are an OEG banty rooster crossed with Buff Orp, Gold Star and SL Wyandotte standard sized hens. There are 5: 2 white, 2 black and 1 buff. They are looking VERY banty like to me and not really growing at all in size but are developing normally, just small. One, the buff one, was quite small at hatch but now they are all the same size.
So, not sure if this is always the case but my vote is that all will be banties!