If you're gonna make a point about a champion at least back it up like otherwise it means all of shit. While Diana IS strong right now, she's being taken in the jungle, as that's where her strength comes from. Comparing a champ that's primarily jungle based to a champ that goes either mid or top is silly. Yeah, if you look it up you'll see that most of Diana's games in Plat+ ranked are played mid, but those numbers are also skewed towards Diana mains. Secondly, LB is in a really shitty spot right now. She's hovering at a nice 44% winrate as the meta just isn't in her favor. Not saying Akali is doing much better (Her winrate fucking DOVE this patch thanks to the changes), but backin' your shit up with facts is hella important for discussions regarding meta.
TBH, Anivia is a really good AP carry to learn if you're willing to put in the time. Galio's also not doing so bad atm. Taking advantage of Runeglaive Ez is probably the easiest way to carry, though since he's still a broken piece of shit.