Comicbook.com has revealed the link between Thanos and Tony Stark in the MCU.
The link was revealed by Joe and Anthony Russo on the commentary of the Infinity War digital download.
Screenwriters Christopher Markus and Stephen McFeely were also on the commentary track.
---They're both aware of something from an early point and constantly having to deal with being smarter. Thanos is a futurist as much as Tony Stark.---Markus
Thanos has immense respect for Stark.