In reinstalling Kelsey on my machine, his PDIALOG entry didn't get put in because I happened to have an old PDIALOG.2DA in my BG2 main dir. I've been bitten by this as well over time with DLG files... since it's just so convenient to extract stuff to BG2 main, look at it there, and so forth.
This isn't something that will affect every user experience, but any WeiDU dabbler or modder could get hit if they're not helpful.
Appending game text ... [./PDIALOG.2DA] loaded, 3901 bytes Not appending [J#Kelsey J#KlsyP J#KlsyJ J#KlsyD...] to [pdialog.2da] because it DOES contains [J#Kelsey] Appending game text ...