Oh dear.
It's only YOU who keeps insisting that the evidence shows that Guede must have "left the scene as soon as possible", Vixen.
You appear incapable of assimilating the clearly-reasonable possibility that:
1) Guede confronted Kercher by around 9.05pm, and started an argument with her which then became physical, then
2) he stabbed Kercher by, say, 9.20pm, then
3) he hung around in the room for 10-20 minutes more (I'm of the belief that he may well, disgustingly, have continued some form of sexual activity as Kercher lay dying), then
4) at around 9.35pm he went to the small bathroom to wash the blood off himself and his clothing (which he himself admitted to doing, Vixen), then
5) at around 9.45pm he went back into Kercher's room to try to clean up and hide her body (being careful to avoid stepping in any blood), then
6) at around 9.55pm he went to the front door to leave, but found it still locked and with no key present (on account of Kercher having locked it with her key after arriving home, then placing her keys back into her bag), then
7) at around 9.55pm he went back into Kercher's room to find her keys, opening her bag to do so, and found & took her bank cards and two mobile handsets at the same time (turning off her Italian handset, but accidentally making two aborted calls from Kercher's stored numbers as he struggled and failed to turn off her UK handset), but he inadvertantly placed one shoe partly onto a bloody section of the floor at that time, then
8) at around 10.05pm he walked to the front door for the last time (leaving the faint one-foot bloody shoe print as he did so), unlocked the door and exited the flat.
Heaven only knows the type of poor thinking underpinning the "reasoning" that the faint trail of single-shoe bloody prints from Guede's shoe leading to the front door IN ANY WAY indicates that Guede must have exited the cottage immediately after (or, for that matter, even
soon after) Kercher died.