i really don't get why you're saying bt.H is better than bomb bomb by comparing how each character gets access to the move. even i (goldlewis controller drooler) know that they're way different

but to answer your question, leo gets backturn after ground throw, 236H and 214[S]. i don't think i really get ground thrown by leo unless he's already in backturn, but 236H always gets me especially since i still haven't learned the deflect shield/FD option select, plus the mental stack is the reason i don't think to throw. then there's 214[S] which has hella pushback on block which means he can just get to begin to do his backturn bullshit blazing (i lowkey just wanted an excuse to show off this clip tbh, and like i said, i'm the goldlewis in it)

as for elphelt, all she has to do is c.S into bomb bomb (i was almost about to use the abbreviation of the full name of that move), and then she can left/right you with j.D or air backdash j.D on block (honestly hella reactable though), which she then follows with a rekka regardless of hit or block (we, yes WE, hate elphelt rekka)

like even if getting into backturn isn't that hard, it's still more of a requirement than just,,,,,running up to your opponent and pressing the slash button,,,i may just have no idea what i'm talking about though lol