There's a lot of speculation about TS's death and from what I understand Michael is all teary because he feels/is guilty about it. (Don't worry Michael didn't kill him according to these sources)

Someone speculated:"About this plan...Maybe K-man has a plan that they should stick with, but Michael says NO and wants to do something else. The brothers arguing w/K-Man could indicate they go Michael's route. But Michael's plan goes wrong & TS dies as a result." And someone who've seen it replied: "Pretty damn close!"