core_version is read at each pin where version_basis says. MAME 2014,
2015, MESS 2015 and CDi 2015 state 0.159 in src/version.c (the libretro
wrapper reports 0.160), MAME/MESS sits on the 0.289 makefile of its pin,
FinalBurn Neo states 1.0.0.03 in src/burn/version.h, FB Alpha 2012 and
its CPS-3 build 0.2.97.30. mame_version of MAME 2014 and 2015 follows,
as MESS 2015 and UME 2015 already said.
100 emulator names the two platforms run had no profile, so their packs carried nothing for them. Each was read from the platform's own launcher or scriptmodule: the same program as an existing profile takes the name in cores:, a different build gets its own profile read from that version, a launcher or self-contained game goes to remove_cores, and the rest are new profiles written from their source or shipped binary. The files they need that the collection lacked are collected from the upstream distributions. Bungie and splitwolf trees are read by path and stay out of dedup.
Abdessamad Derraz