Never question the motives, or plans, of a murderer. Especially one that wishes to get away. Pulling off a scenario like this would be perfect, break into some random dudes house, kill your target in their house, either kill the other person (which defeats the purpose of breaking in unless you want it to look like murder suicide) or threaten to kill them if they tell anyone. Most likely that person will shut the fuck up from fear of dying the same way they just watched homeboy die. All while at the same time, like in this situation, evidence points to this guy because of the blood found in his place. Why does a set up like this sound so far fetched? People have done crazier things to get away with murder.
One thing I learned in film school, real life can be more unbelievable and 'coincidental' than even Hollywood can make up sometimes. So just because you think a situation looks one way, don't automatically assume you know the truth. For all we know, this dude could be telling the truth an being set up.