there was no reason to talk about the dream. Justin's been having nightmares since his mother died, so brian did what he does best, he took action, and held justin.
they wouldn't talk about them too much.
he lived with isaac for two and a half years. he knew isaac for three and a half... so yeah, six months of hospital care and overprotective people, even with therapy daily won't completely stop all the negative thought processes.
his first instinct when someone helps him, or does anything for him is that his response HAS to be what they want or he'll be punished, that's what he learned from isaac.
the tenderness brian shows with justin, is love. on that you are 100% correct... now we just need brian to realize that... and you know, justin figuring it out wouldn't hurt either.