I actually suspect that everyone but Rukia is at captain level. Ichigo obviously is and Renji actually has the rank. Even if Ishida doesn't have a handle on the amount of power he used in the Soul Society arc, he could still be at that level. As for Chad, the captain he fought actually said that one of his blasts would be dangerous to him, so if he has more speed (and more likely greater power) he could be a high level opponent.
Still, they should only be good for one Espada-level opponent each. Unless this recent business with good Hollows results in someone like Hanataro and an incident like Aizen's "death" to distract all the Espada. My hope is that they will all fight, with a mixture of wins and losses, the Orihime issue will be resolved one way or another, and things will move back into training mode.
samuraidragon wrote:I'm also assuming that this will be a way for Ichigo's 10 second limit for releasing his hollow will be increased.
With what has recently been said about Hollow powers being stronger in Hueco Mundo, I wonder if he won't be able to extend that time here (and I suspect the entire incident will lengthen his normal limit).