I love this, it does about the same amount of damage, but the most important part, you don't need to Dash 5b and you don't need to judge how high you need to be to belial since you're at the corner. Corners make belials oh so much easier.
Only downside about this is that it is slightly harder to dash back across and press 5D. And every j.b 623C situation will be different because you won't know when and where you will hit them with it because people can time their tech rolls.
Edit: Oh yeah, if you do fuck up the dash back 5D, they have to eat the 5D AND they're still in the corner eating your pressure and mixup. win-win
Edit2: doing the dash back corner combo I found a 4255 (DID)/ 4227 (hell's fang) damaging combo. It's pretty much the same thing, but after the GH and followup, use 2c 5d DC 6a instead of 5b 6A.
It does a lot of damage and it keeps them in the corner at the cost of only making around 40~45 meter instead of the big 46% with the double belial.
Ok this is getting complicated lemme write it all out
J.B 623C, RC, dash to other side, 5D(1 hit), 214B, delay 214D, 2C, 5D (dc), 6a HJ.C, J.D, jc, J.C, 214C, 5D, 214A, 214D
4227 dmg and around 40% meter built back.
Things to look out for, don't delay the gauntlet hades follow up that much or 6a won't connect. I don't know why this happens, probably has something to do with the height they are at when you hit them with 2c 5D. Also find that timing to get the follow up for hell's fang every time, the combo is really long so there is a very small window of getting the hell's fang just right
I would do this combo every time after you reset them. If you try to go for the DID finisher, I don't think they'll try and roll out again after just eating 4000~ for rolling out.