Just remember: every little thing they are showing and having Spivey comment on is a lie told by JY in his testimony in trial #1. Big lie, little lie, they are pointing out his lies, one by one by one.
There is no one big smoking gun! It's the totality of the evidence. It's the many, many lies. If you are waiting for the big Perry Mason moment followed by dramatic music...you will be disappointed. Circumstantial evidence cases are made up of many pieces. This is where having common sense is vital. The state will put it all together in context during closing arguments (hopefully). They can't do it now...they can only introduce evidence and have the witness testify to what each item means to them.