I doubt the colour difference in the Ash body when wet is because of glue. More, as it appears similar on both sides I'm suspecting it is because of differences in direction of the grain in the wood between the three blocks that form the body. Two are similarly cut but the third despite it actually being prettier is cut slightly differently along the grain so the water coloured it in a much stronger way.
As for grain lift, after wetting the middle lifted heaps yet the top and bottom blocks remaind almost jet smooth.... It will be interesting to see how it all sands back.