Knew what I was doing, just didn't think twice about it. Anyone know the simplest mod I'd have to make or the simplest console command to type to make the main quest skip that stage and still work? Or would it take altering nearly every line of dialogue in the main quest or something else insanely time consuming?

Find the quest in question, then find the stage that the Orc would complete for you, and enter that console command. The quest stages are at the bottom of each quest:

http://www.uesp.net/wiki/Morrowind:Morrowind

With most quests, you only have to set the next stage. Some quests bump your faction rep or game rep, and some give you reward items, so those may need to be consoled in. However, no need to enter a bunch of dialogs.

You sure? after all that blades guy whose name I can't quite recall had a dialogue line basically telling me that he was mad, didn't care about the empires orders, and wouldn't work with me 'cause I killed the orc.

Check the quest stage, the one for killng the Orc is numbered higher than the one for talking to them. Use the console to remove the journal entry that killed the orc and put the other one in. I think if you just use the Setstage command, you can go back. I don't think Cosades looks at the Death Flag. You can always fire up the editor yourself, pull up Cosades, look at his dialog, and see what conditions cause him to tell you to go away. Then you can remove those.

Great idea, thank you, will do this.