Wowzer! This DA is confident. Smells like evidence to me!
The way a detective friend of ours explained it to me is that LE names a suspect only when and if they have enough evidence to arrest and charge the person, and enough to at least have a prayer of winning at trial.
He said the reason they don't immediately arrest in those circumstances is because every DA wants enough evidence that they can be confident of winning the case at trial.
So, they'll name a person as a suspect, and they're prepared that if the person tries to run, they'll arrest and charge them. But what they're waiting for otherwise is to collect more evidence to increase that confidence level of a successful prosecution, which is what we want them to do - we don't want perps walking free.
So... when I see a named suspect, personally, I am fully convinced the person committed the crime.
Good job, LE and DA!