On what evidence does Mulder base that? Mulder saw less than we did in that bathroom. This is yet another example of Mulder using less than typical detective skills to jump to conclusions.
Clone Episode Inspired: Anasazi!Krycek
By now it's rather evident that Krycek is playing for the consortium as an assassin for hire. He certainly looks good doing it though.
None. Krycek didn't get to do a lot of talking in this one what with Mulder using him as his personal punching bag. (This is of course the first of many such incidents.)
It's a definite ten chicas! This is my favorite Krycek look. The hair is longer and he is finally picking his own clothes instead of wearing CSM's FBI camouflage rejects. And if I may say he chose well. (Rowl!) That's not to say that he wouldn't have looked good in a suit. Men usually look good in a well tailored suit. Unfortunately, the FBI camouflage gear did not qualify as such. And who would miss it with the current ensemble anyway? The jeans and leather jacket he's sporting are simply delicious. Also, thankfully, the God-awful gel is gone as well. (Look Ma there's movement!) What more can I say?
Killing Mulder's father: We don't actually know that Krycek did it. Now admittedly, it sounds like I'm grasping at straws but it is possible that Luis Cardinale had a hand in Bill Mulder's death. However, given the size of the window and the speed with which the escape was made I'd have to grudgingly agree that Krycek killed Mulder's father. Having said that shall we all remember that Mulder's father wasn't exactly what one would call an innocent bystander?
On the other hand with Krycek being at Papa Mulder's house there's no way he could also be in Washington DC to take that shot at Scully at Mulder's apartment. So blaming him for that would be wrong.