Apparently, J'zargo was killed in a fight so I resurrected him using the console. He sprang back up but the follower dialog options were not there (I loaded a previous save before he was offed and plan to set him as essential). However, the following appeared after I typed the essential command:

Get knock state (Enum) >> 0.00
Paired animation = 0.00
J'zargo is NOT bleeding out. [emphasis not added]
Right hand item type >> 7

Can someone decipher this? Does "J'zargo is NOT bleeding out" mean he wasn't dead (he was lying prone on the ground, not on his knees)?