If you have decided you'll call it a suicide, then you certainly would not need to expend as many resources. This coincides with what I said not long ago.
Where does it say that Gore/LE did not look for Dina in those videotapes? I think they did look and had to settle for the cell phone pings - I don't think we've seen any proof of that though.
They had to find something to claim they had checked out Dina's alibi after all those claims of Dina and Jonah standing vigil over Max's bedside - then we find out Dina wasn't even there for many many hours on Tuesday (12-14 hours per my estimates) nor was she even there on Monday until 5 hours after Max had his accident. We already know that from the time Max was hurt until Rebecca was murdered (let's say the latest was 3 am) about 1 1/2 days, that Dina was gone from the hospital nearly half that time.
If you think DA's and LE never lie, manipulate the interpretation of evidence, or withhold some evidence then you don't know much about wrongful convictions beyond the 'eye witness' account stuff you keep citing when it fits your theory to do so, e.g., discredit the man and his wife who say they saw Dina at the mansion.
Based on what has been said, it supports my idea that there were possibly people who claimed they saw Dina at the hospital (some of that time), but their stories had problems, there was conflicting information, the sources were not credible or couldn't remember exactly, or .... Gore couldn't reconcile that enough to count it as an alibi. He never even mentioned eye witnesses did he?
And, you know how unreliable eyewitnesses are anyway.