I think it would whittle down to not much and be in the same spot various notorious no-body cases landed, like Susan Powell, Kyron Horman, Ayla Reynolds, Michelle Parker, etc. Just hoping somehow for a slip up or the discovery of a body.
The FBI and CBI simply don't start with a weak investigation and then ramp up to a "more robust" one after time goes on. They start out hard.
All the major investigative work like electronic/computer analysis, witness and POI interviews, is done early on. A lack of evidence doesn't magically translate to these incredible agencies somehow suddenly deciding to do their jobs.
The dates are pretty clear. Unless KK had a time machine, she wasn't there on the 22nd. And it's pretty clear KB was killed on that date.
Yes, anyone is free to believe whatever they feel like believing, even when what they believe isn't support by fact. But my question was how can you second guess them "when the evidence thus far appears to clearly support the charges against PF and indicates KB was not there", not "how can you second guess them?".
Your answer didn't give any facts or reasoning beyond that you can believe what you want to (true) and that no one is infallible and there "might" have been other options.
Seems thin at best.