Its 30 years later guys. I don’t know what evidence you think there is to discover now. Cobain offed himself with a shotgun so I’d imagine it made quite a mess.
My cousin lives about a block from there. I went to look at it one time when I was visiting. The new owner tore down the garage because he was tired of the stoners leaving crap at the site to “honor” him.
It didn't make the mess that investigators have seen time and time again. That got some people digging, and several other inconsistencies were found. Whether it's enough to overturn the original report of 'death by suicide' remains to be seen.
Most investigators will tell you every crime/death scene is different, and there may be some loose ends they just can't tie up. Cobain was suffering from depression, and he was using heavy drugs, but that doesn't automatically mean he killed himself. A fresh set of eyes on the evidence can't hurt.
20 years ago they already made a film about this.
Human beings are prone to conspiracy theories.