John the Baptist is our model. He taught us that a person can be a Christian although he has very little. Jesus rebukes the second disciple. This one is described in vss. Jesus invites him to follow Jesus, to be His disciple.
Burial is a necessity.
Jesus does not forbid it. He does not even forbid Christians to bury their parents. He is talking about a family attitude. Burial is not a required, religious ceremony. It's only a physical necessity.