The only way for it to be recessive white would be if both parents were carriers of the gene. One would not make it happen. I'm not familiar with the genetics of the cream crested legbar, sorry.
Wayne Meredith used to get recessive whites from his wheatens, but for some strange reason they would leak more or less pheomelanin around the head/hackle/upper breast area. Never did figure out why. Years ago I saw it in bantams too, and Wayne created the LF wheatens with my bantams and crossed them with easter eggers to make the large fowl, so it's not surprising. Don Cable also hatched some bantams like that in the very early years, and his also came from my stock.