Now concerning dividing the spoils with the Strong and the Great -
Some may make the case that the strong and the great refer to overcomers. for Christ reigns with co-kings.
While that interpretation is clearly possible, I think probably a better one is that the prophet meant God is
"the Strong" and
"the Great".
One reason is that in this prophecy the Suffering Servant is more often classed with the sinners, the transgressors, the guilty RATHER than the righteous.
"And they assigned His grave with the wicked, ..." (v.9)
His lot is thrown in unjustly with
"the wicked".
He is cut off from the land of the living - living sinners.
" ... He was cut off out of the land of the living." (v.8)
The emphasis of His redeeming act is that He in CONTRAST is not like those whom He came to redeemed.
Most of the prophecy is how Christ was classed unfairly with LOSERS. And He came to save them.
" ... the righteous One, My servant, will make the many [sinners] righteous." (v.11)
He is numbered with the transgressors.
" ... He poured out His life unto death and was numbered with the transgressors." (v.12)
He is OUT OF PLACE with those who are unworthy of His company. This is the general theme. So while I could not insist that
"the strong" and
"the great" could not be those whom He justifies, I think it is more consistent that the CONTRAST between Him is maintained.
Being unlike them, He nonetheless saves them.
Therefore, I think it better to understand God the One sending the Suffering Servant is
"the Great" and
"the Strong" rather than the justified wicked and transgressors, lost sheep and offenders, sick ones in need of healing and violent, iniquity filled and sorrowful.
"Yet He alone bore the sin of many and interceded for the transgressors." (v.12)
The distance between the two - the Suffering Servant and those for who He interceded is emphasized throughout more than His being LIKE them.