I agree that Hasbro appear to have done an outstanding job in trying to make Sky Shadow look a least like Overlord as possible. But I still think that the original Generations Sky Shadow looks so much more like Black Shadow, and that would be because it was a retool of Thunderwing, which the original G1 toy was as well. But obviously Hasbro needed to retool Overlord as something, and there isn't a whole lot of obvious alternatives, so Sky Shadow's about as good a choice as any, I suppose.
I'd rather they produce a Generations Blades and make it a mould-mate of Blue Bacchus. The real challenge would be Vroom. Who the hell do you redeco him as? Maruten's suggestion of having Blue Bacchus (and perhaps Crossblades and Vroom) as individual Titan Masters isn't too bad.
The split transformation makes perfect sense for Overlord, but yeah, it'd be weird for Black Shadow.
And adults!