highly attained beings with real bodhicitta act very differently from normal beings, and with reasonings that we cannot fathom, simply because we do not have their level of compassion, so a lot of things they do seem weird and out of worly norms to us, but that is real bodhicitta.
to us it may seem that the manager slow down trijang rinpoche's work, but to trijang rinpoche, perhaps he was not at all concerned about the growth of his work, he simply cared for rigzin so much, that he wanted to keep rigzin near him, even if it so-called slow down his work, simply because trijang rinpoche is kind enough to keep him around and if he let rigzin go, probably something worse would happen to rigzin, that's the only motivation of trijang rinpoche of keeping him around.
and today there are many attained gurus who are doing the same, where we always see very bad people around them and we wonder why, and we think that the gurus will be much better off without these people around, but that's exactly why there are being kept around, some possible reasons could be if they are around they still have the chance to serve the gurus, thus collecting some merits, if they go, they would fall even faster and deeper, so it is out of the kindness of the high lamas, and only with that level of compassion, that the so-called troublesome, problematic people are still hanging aorung them. the lamas' concern for their well-being is much more than the trouble/problem/discomfort to himself that they are causing him, this is real selfless and compassionate act, this is real bodhicitta.