Galan007
|Quantum Observer|
-In Darth Vader v2 #12(set shortly after RotS), Vader was officially given the title/rank of 'Emperor's Voice', and also headed-up the Inquisitor program. He was able to punish/kill anyone in the Empire(no matter their rank), except Tarkin.
-By the time of Rebels/ANH, Vader commanded everyone in the Empire except Tarkin, who was well-established as Vader's superior officer.
-In Darth Vader v1 #1(set just after the events of ANH), Vader was demoted by Palpatine as a result of his failure with the Death Star, and put under the command of Grand General Tagge.
-By Darth Vader v1 #25(set shortly before ESB), Vader had finally redeemed himself to Palpatine, and was given back all of his previous power/authority. However, without Tarkin in the picture, he was now *the* highest ranking official in the Empire, barring the Palpatine himself. This is also when Vader was officially given more of a militaristic role: Sheev gave him control of the entire Imperial fleet, and command of the Executor.