I doubt that is ever a reason for a promotion, since it's unknown the player will do better at the higher level.
If the value increases with the promotion, it would be just as helpful to keep the player than to trade him, IMO.
I think this kid is the real deal, and I think Bloom is looking at getting serious input from the farm over the next few years. That's part of the strategy of improving the long term outlook while building up the 40 man roster, at the same time. It's a delicate balance, but so far, Bloom has traded away very few prospects, and none that had super high value. The highest ranked prospect traded was Aldo Ramirez (correct me, if I'm wrong), and he was ranked 9th by soxprospects.com, last spring.
He's added prospects Whitlock, German, Winckowski, Seabold, Binelas, Hamilton, Koss, Downs, Wong, R Hernandez and others via trades. Clearly, this has been a high priority. The results on many of these guys are yet to be seen. Surely, some will fail, but there is some good talent in this group, and some will likely do well. Whitlock has already shown a plus.
Bloom has also benefited from some DD prospects that eventually rose up to ML readiness and have contributed, namely Houck and Dalbec, but there are more that are nearing ML readiness, soon- like Duran, Casas, Bello, Mata, Murphy and Rafaela, among others.
I'm liking what I see on the farm, but we are still not a top 7-10 system. At best, we might be viewed as top 10-14.