Questioning logic
1) why not send simultaneously multiple rockets with payloads along with human spacecraft.
2) why using redundant slow rover to transport humans. This is 2033 . Drones ?? Or even faster all terrain capable hover craft
3) most important point, before any human comes to mars robots 3d printers should have already been sent and create a mini colony.
And Lastly if there is no significant atmosphere why even colonise.
One musk theory suggested to nuke it to allow possibility of creating atmosphere so whats the point in going to Mars before this isn't achieved.