This is all about the design. Yes, yes, we all know that the Scout is a couple of points under-costed but that's not what I want to talk about.
Scum has wormed it's way into lists across the world (frankly they needed some help) and one of the primary reason is design. Not just cost, but design. FFG has thrown the shackles off from Scum.
Here are a couple of examples. When N'Dru was created his ability has a range limitation (1-2). Manaroo has no such limitation. He can pass as many tokens as he wants to any other ally anywhere on the map. Scum don't fight fair anymore. It's not just one ship though. Zuckuss crew can take a never ending stream of stress to force you to re-roll those nasty green dice. Yorr can only take 2. Overclocked is another infinite repeater. 4-LOM doesn't "share" stress he deals it. For me the rock bottom costs of Scum Wave 8 are nice but it's truly lack of inhibitors which has vaulted them soundly into the meta.