Originally Posted by Muttley76:
“why would she remember some random bloke she half-saw and exchanged a few words with by the time Nine regenerates?”
Well of course because nothing of significance happened in her life between that night and the regeneration.
And of course 10.5 has no knowledge of it at all. But we'll never know, in all likelyhood, because if Rose ever comes back it will be after 10.5 dies - either it will be without Tennant, or Tennant playing the 10th Doctor. There's no point in ever bringing back 10.5.