actually there are 2 notable combos + the rejump combo and character specific one
this one: 2a5b2b5c2c3c aircombo.....
http://www.youtube.com/watch?v=9J0t3YSdmOYwill hit almost the same
some comparations with the 2a5b2b4c2c5c2b aircombo
2a5b2b5c2c3c j.bc dj.bc ad.bc grab will hit 4904 on v.akiha
2a5b2b4b2c5c3c j.bc dj.bc ad.bc grab will hit 4913 on v.akiha
2a5b2b5c2c3c j.bc dj.bc ad.c grab will hit 4785 on v.akiha
2a5b2b4b2c5c3c j.bc dj.bc ad.c grab will hit 4802 on v.akiha
if after 5c2c the character is too far for 3c to hit you can always summon.. or you can choose to use 2c5c3c instead if your reflexes allow to think that fast.. actually there are no benefits using this combo but to cut the 4b from the chain.. if its on block you can finish with a low atk, but thats not big of a deal.. oh, and if you confirm with b, this combo will always hit more then the other one (when you have time to aprox and punish you can use this, confirming with b.. hint to keep close of your oponent: do 2c as soon as you can after 5c, and 3c as soon as you can after 2c.
now on fat characters (I dont know everyone this works) but I'm sure in nero you can add 4b to that combo and this will hit more then both above, but it requires you to be close of your opponent.
about combo after summon akiha kicks:
I'm still not sure of it, but these are so far the most damaging ones I found.. after Akiha kicks, always 6(c).. now.. sometimes it will crossup, sometimes it will not.. it depends the distance you hitconfirmed, and the timing you did the 6(c).. the timing may chance according to the hitconfirm.. but its ok.. there is a generic follow up
crossing or not you can always 6(c) 2c5c3c aircombo
if your oponent didnt crossup above your head you can do after the 6(c) a 2(c)
not crossing 6(c) 2(c) 5c3c aircombo
here are a video exemplifing
http://www.youtube.com/watch?v=4p_-vgiMhGcI was going to create a video with every hitconfirm variation crossing and not crossing but then I realized hey! its the same combo, its too much work for not much since the idea is still there.. then there are only the 2aaa and 2aa hitconfirm variation.