I don't think Delenn ever stops thinking of herself as Minbari, no matter the biochemistry of her body, though in the episodes we're about to watch she'll rethink what this means. It's interesting to compare this to Sinclair/Valen, because in a time-travelling chicken/egg way they were each other's model. Sinclair's transformation into a Minbari strikes me as much more of a sacrifice, because he really gives up his entire human existence (and his own time) for it, and as far as we know (and as far as he knows), there is no way back. Like Delenn, he has spent some time as ambassador among the people he's about to join, and like Delenn, he's gone from fighting them to joining them, but unlike Delenn, he does not have something major to atone for, surivor's guilt notwithstanding.