A mash combo is just that, A mash. No motions needed.
Midscreen (meterless) you want to do 5A > 5A > 2B > J.A > j.c > J.A > J.B > j.D
You might want to switch the J.B > J.D ender if you have a shitty item up next and just opt for J.236A.
With meter you can do 5A >5A> 5B > 236D > 236236D > 66 > 5B > HJC > J.C > 5B > 2B > etc etc
You can do rising jump B but you won't get to reverse gatling in to j.A.
To combo off Jump B you need to have enough time to cancel into j.A before they hit the ground.
You can do IAD J.B > J.A, which seems like his best pressure tool outside of having items out.