No.
Honestly, no one knows if Grimmjow is alive or not at this moment in time.
However, fans have been speculating that it was Grimmjow you could see a bit of in the background back in chapter 518, as it matched Grimmjow's clothes and Ichigo recognised the voice, and was not particularly happy about it (it's to be noted that it hasn't been confirmed that it is Grimmjow yet, as whoever it was wasn't shown fully, it's just speculation, very likely speculation)
Ulquiorra definately. Grimmjow rank #6 Ulquiorra rank #4 Plus ichigo first beat grimmjow if grimmjow actually was stronger than ulquiorra then after he beat grimmjow, the stronger of the two he wouldve mopped the floor with ulquiorra :)
in episode 140 or 141 when she is leaving the soul society after training with Rukia
Grimmjow's sword name is Pantera!
When a soul from soul society dies, they are reborn into the human world, with no memories of their time in soul society.
It's when u capture a soul so you can use it's raw, untapped energy. You must make sure the crystal, or "soul gem" is the exact size of the captured soul. If it's too big or small, the captured soul can leach into whoever posseses it.
Grimmjow's released form is called "Pantera", which is Japanese for Panther King and Spanish for Panther.
you can sell them to the soul collector or put them on the soul market
Yes he is.
Yes
6
Sadly, no. :(
Grimmjow appears during Arrancar arc. In the manga he makes his first appearance in chapter 198 and in the anime episode 116.