Originally posted by Enyalus
It was Warlock who came up with most of the plan to beat Magus with the Cosmic Cubes/Infinity Gauntlet, and Thanos has acknowledged his cunning and respect for him on panel.
They worked together on that so both were needed. I agree Thanos respects him but when Thanos puts his mind to something no one is more dangerous. I know it helps Thanos out that he isn't a hero but even the Magus was done in by Thanos and chose an exact doppleganger as his thrall.