Those two chicks are white eyed, I am extremely familiar with the white eyed gene. Done a lot of work and crossing with them for many years.
White eyed is dominant or co-dominant.. although how it looks varies in a cross. Some birds will look barely different from a blue(so this answers your question- yes he can look normal blue as adult), while others will show quite a good bit of white eye characteristics. That girl is a rather nice example of how a white eyed hen looks, the greyish tint with the sugar frosted look. The male chick looks a little more blue, but I recognize the sugar frosted look on his wings and back.. that is why I say these two are white eyed.
The adult peahen shows none of the white eyed characteristics. I do see a possible slight "sugar frosting" on the barred area on his wing. I have had many males where the only white eyed character they showed was a slight sugar frosting on this area.. easy to miss if one were not aware or looked that closely.
Amount and size of "white eyes" on tail also varies. On one end, it can be on every eye, on other end, just one or two or even none.. Again on one end a lot of the white eyes can be really big.. or very tiny (a single bird can even have white eyes of all sizes). Will just have to wait until he fully matures and grows a full tail to see how much and what size white eyes he will(or might not) have.
You got it right about purple- the (adult) hen is not(and does not have) purple. Since she doesn't seem to show anything associated with white eyed, I would think it is the male that is white eyed and split for purple.
As for white flights, you will just have to hatch more chicks.. if any come out solid white then both parents are split white. If no white chicks show up after hatching more than 10 chicks total, then they probably are something like dark pied. You would find out much faster by putting a white hen in there but that would test out only the male..