Secondly, I'm not sure Imperial is the best boss to look at parses of, because of the Mind Control. So lets scrap that.
Also, your spec score link shows Combat above Assassination, I'm not sure how the spec score is calculated but does that mean Combat does more DPS than Assassination? Seems unlikely to me.
And as said above, Raidbot takes the Median DPS I believe? WoL ranks shows Warriors to be beating Rogues on a lot of fights i.e http://www.worldoflogs.com/rankings/.../Fury_Warrior/
I chose Feng as the example because it's arguably the most accurate single target fight in this tier for looking at logs. There is some AoE to mix things up but meh what can you do.
The Thread is about Rogue burst so I'd like to get back to that and maybe in a different, more relevant thread we can discuss who is the best melee DPS class at the moment.
Just quickly, you say Rogues are by far the strongest melee in game, I don't think 'by far' is accurate whatsoever.
Here are the bosses you linked, but instead of Default Measure, I set it to 95th Percentile, showing the top 5%.
Only 1 (Grand Empress which is COMBAT) shows Rogues on top, and this is from parses of people who clearly show they know how to play there class. The Thread focuses on Assassination, of which that spec doesn't parse #1 on any encounter I looked at in the entire tier.