After this stroke he suffered a great deal from paroxysms of pain, and was manifestly unfit to give orders, although he soon resumed the command.
The historian almost refuses to chronicle the startling fact that 37,000 men were kept out of the fight, most of whom had not fired a shot, and all of whom were eager to go in.

The whole of the First Corps and three-fourths of the Fifth Corps had not been engaged.

These, with 5,000 of the Eleventh Corps, who desired to retrieve the disaster of the previous day and were ready to advance, made a new army, which had it been used against Stuart's tired men would necessarily have driven them off the field; for there were but 26,000 of them when the fight commenced.

To make the matter worse, a large part of this force--the First and Fifth Corps--stood with arms in their hands, as spectators, almost directly on the left flank of the enemy; so that their mere advance would have swept everything before it.

Hancock, too, says that his men were fresh enough to go forward again.
Couch succeeded to the command after Hooker was wounded, and made dispositions for the final stand around the Chancellorsville House, where the battle lasted some time longer, and where a battery of the Fifth Corps was sacrificed to cover the retreat of the troops.
He did not, however, take the responsibility of renewing the contest with fresh troops, perhaps deterred by the fact that Anderson's and McLaws' divisions had now effected a junction with Stuart's corps; so that the chances were somewhat less favorable than they would have been had Sickles and French had been reinforced before the junction took place.