Naturally, the details are up for debate: Some in the 40kLore subreddit think the lead in Space Marine 2 is actually a different Titus (apparently it's a pretty common name in the Ultramarines) while others say there's a small window between the times of Severus Agemman, who was promoted from command of the Ultramarines 2nd company to the 1st, and Sicarius, who replaced him, in which Titus could have held the role without disrupting the timline. Along with the lower rank, Titus has also crossed the Rubicon Primaris in Space Marine 2, meaning that he is now a Primaris Space Marine-another change from the first game. There's probably a lore-based explanation for the demotion-Warhammer 40K has lore for everything-but according to the fan wiki, the change was made to accommodate a conflict with (you guessed it) the lore: Canonically, the Ultramarines 2nd Company was actually commanded by Cato Sicarius, while the events of the first Space Marine game took place in an alternate universe in which the company is commanded by Captain Titus. Those of you who played the original Space Marine may be wondering why Titus is not a captain in the sequel, but a lower-ranked lieutenant instead.

Instal Warhammer 40,000: Space Marine 2