Why did Michael have a dispute with Satan about the body of Moses?

What do you understand is intended to be conveyed to us by the dispute of the archangel Michael with Satan over the body of Moses?

Jude 1:

We have the full account of the death of Moses in Deuteronomy 34, but no account of his public funeral, for he had none, but, as is expressly stated, “He (i.e., the Lord) buried him in a valley in the land of Moab, over against Beth-peor, but no man knoweth of his sepulchre unto this day.” There must be a reason for this. I think it is that were it possible to examine the grave of Moses to-day it would be found empty. But someone will say, “How could Moses have been raised from the dead seeing that our Lord Jesus Christ is in 1 Corinthians 15 called ‘the first-fruits’ of the resurrection, and in Colossians r, ‘the first-born from the dead’?” This is an important question.

It was impossible for anyone to be raised on to true resurrection ground till our Lord rose. Then if Moses was raised, it could only have been back on to the death plane, as the various cases of resurrection of the Old and New Testaments prior to our Lord’s resurrection, such as the son of the widow of Sarepta, that of the Shunammite, Lazarus, and the widow of Nain’s son, etc. All came back on to the death plane and died subsequently. I think the incident narrated in Jude refers to the raising of Moses back on the earth plane. If he is one of the witnesses he will die again. No man can die physically after true resurrection. This gives an added completeness to the scene on the Holy Mount: The Lord the centre, Elijah representing them who will never pass in death, Moses the raised one. Satan might legally contest a premature resurrection of Moses in the true sense, while he could not possibly urge any legal objection to Moses being temporarily delivered from the state of death. “It is appointed unto men once to die.” If Moses is to be one of the witnesses, his death will be true death.