First Combo: 2S after the 2H seems unnecessary and made the rest of the combo fall apart, not to mention needlessly difficult. The best thing against Potemkin after the 2H bounce is your standard j.S,H,D,orbs x2 with a double keygrab at the end made possible by his heavy weight.
Second Combo: The addition of Danzai is also kind of unnecessary after 2H. Unless that is, your Moroha gauge was almost up then 2H (1 or 2 hits), Danzai, 66, 5S, Keygrab, OTG Keygrab is the way to go.
Third Combo: See above.
Fourth Combo: Seems efficient and has some style if anything. Looks like at the end you could have gone for the double keygrab.
Fifth Combo: Wow, it's defiantely apparent you're an I-no player. As pleasing to the eye it is to see the CL-esque Orb cancels, I'm not so sure combos like this are an effective use of your tension most of the time. I'd just refer to the Aba guides for more conventional combos.
.:EDIT:.
Beastly Combo for Middle/Heavy Weight Characters:
j.S JC j.S, H, land, 5K, 5S(f. 2 Hits), Rekkas FRC, 66, 6H (1 Hit), 669, j.S, H, D, Orbs, land, 66, 5S, Keygrab, OTG Keygrab
Confirmed on Anji, Venom, Testament, Potemkin.
19 Hits 215 Damage Avg (175 on Pot)
Adding the jump cancel in the beginning allows for the double keygrab. Take the jump cancel out and they'll tech before you can dash in at the end. I don't understand the why but I'm loving it.