I just clicked on your name and then "view posts" in the drop-down and there it was. The forum search can be a bit of an acquired taste though and has things to confound the unfamiliar (the search period is one that's bitten me a few times).
I *think* Original Sin II would need to come between DD and BD: as Lucian was a nobody before DD, given that he's the protagonist, or rather she is in my game, and BD kind of builds on all the fallout.
But other than that, yeah, Dragon Commander is ancient history, thousands of years in the past; over 1,200 years pass between D:OS and DD, then another 80 between DD and DKS during which all the other stuff happens.
