Of course ... everything runs as softly as olive oil.... I suppose you don't see contradictions not even in what Knox tells then...
Actually she received her fatal stab in a spot left from the closet. But your second statement is just false, and anyway, unreasonable.
Bruises indicate normal blood pressure. Especially superficial bruises like those ones, that even have a reddish or lively pink colour. It is an elementary fact.
A person who is dying of a fatal blood loss is in a state of hypovolemic shock, that means foremost a dead fall of peripheral blood pressure. If the central pressure drops quickly, the body reacts by dramatically cutting off the peripheral blood circulation. Then if the person starts to suffer a hypoxia, as unfortunate Meredith had, blood in vessels won't be of bright red colour any longer and any possible bruises would look violet, especially if in superficial areas (where you would also detect cianosis). But anyway, after the fatal stabbing there wouldn't be enough time for Guede to wash his hands (and feet, or trousers) accurately (he had bloody hands, but left no hand print on the body) and then come back into the room, grab her with clean hands without leaving any prints on her body, undress her, place the pillow beneath her: you need minutes to do that, and this Meredith still having a blood pressure with a blood loss of that magnitude?
All this is improbable and concocted by definition.
Actually, I am based on the evidence. Not on prejudicial assumptions.