I agree wholeheartedly on Billy, and I think that's what separates the two versions, in terms of appeal, as well. One of my all-time favorite DC books, and, in my opinion, arguably the greatest Captain Marvel books was Shazam and the Monster Society of Evil. I look at a character like Talky Tawny, for instance, who is, essentially, at least, in that book, a hobo, and how he's probably Billy's best friend, and yet, imagining Geoff Johns and Gary Frank's Billy, I can almost picture the disgusted sneer that Frank draws so well, would he ever come across such a character in his arc.
I don't feel like Cyborg needs to be made "epic," because, frankly, I don't think Cyborg should be in the JL. He was a Titan since his conception, and, so a Titan he shall remain, in my mind, at least. I always viewed him as the backbone of that team, and it was kind of interesting to see that parallel; how the Titans books totally floundered when he got upgraded to JL status. I'm not saying that's the entire reason those books sucked, but I do think that, in terms of construction and the character dynamics, it could've been a contributing factor.