1. IAD j.2 allecan, 5C, sj.B,j.c, DJ, j.2C allegretto
or If Nirvana is close behind you, you can Vivace A away from her so when the opponent comes flying back at you he'll go in between you and Nirvana and you can hit him before he hits the ground and combo into nirvana's 8D.
2. Not sure what you mean by "with nirvana stood over you both"
3. From the ground I'd recommend doing a combo string into 623C then going into an air combo. You can also RC the first hit of the 623C and IAD j.2C allecan and another ground combo into a 2nd 623C if you're really trying KO the opponent.
4. If you're close enough you can push nirvana forward while getting closer to the falling opponent catch him with 5C or 5B before he lands. You can then proceed to go into a normal air combo while also being able to throw in a 2nd 623D in the middle of it.
5. If nirvana is right at your back, you can use 2D to hit the opponent after the 623C. Vivace to get to the other side of the opponent then proceed with juggle combos.
If the Nirvana is far away you can time 41236D to hit the opponent as they're being pulled up by the 623C and then go into an air combo.
Or you can go straight into an air combo after the 623C and have nirvana do 623D.
6. There's a bajillion things you can do. To many for this post. You really need to watch videos to see the amount of mixup options Carl has. If there is a "best" option then I would assume that there are multiple "best" options. But to get you started:
- Instead of 6D do 4D and use A vivace to cross them up before the 4D hits. Do A Vivace again so that the opponent will come flying back in the middle of you and Nirvana and proceed into juggle combo.
- Theres the standard IAD j.2C allecan crossup
-You can do a blockstring and time Nirvana's 2D and one of your lows to hit at the same time to create either an unblockable or a really quick high/low block string.
There's so much he can do.