Why are there so many that are 150? Until you get one that's 160 they are fine, but once you have 160 sparrows there is absolutely no reason to ever use (or even keep) another 150 sparrow again. What do we get from Faction Rally? 150-speed (useless) sparrow. As we know, there is no way to upgrade the speed. I'm guessing that Bungie decided to hold back a component that would upgrade the speed, for whenever they do SRL again, but who knows, and that is also stupid. The speed of the sparrow affects the players' time in getting around from place to place, so it is not insignificant. Sparrows are have more importance in the game than ships do. If we cannot just buy a component to upgrade the speed, another way might be to dismantle a sparrow that is 160, and get from that the component needed to upgrade a 150 sparrow to 160. This would ensure you've done enough grind to get your first 160 sparrow, and then from there you can upgrade 150 sparrows by dismantling 160s. Maybe you have a 150 that you think is just so cool to look at, but you never use it because, why would you (not 160)? This would be a situation where dismantling an ugly 160 would be worth more than just the Bright Dust you get in return. And horns? And acrobatic sparrows? We had them in D1, but whatever, these don't affect my gameplay (just my enjoyment), so fine, hold these back for SRL (if we ever see it again) if that is what you're doing.