IMO Because the State is using money and Merritt being cut from the business as a motive to kill Joey and the family, it's only right that others with those same motivations should be examined.
Whether Dan did or did not do this, LE did not investigate Dan in this regard, even with the knowledge that Joey was cutting Dan out (from Susan and from McG) and whether Chase was or wasn't being cut out seems to be up for debate IMO. Dan's paypal and bank records were subpoenaed by the defense, the lawyer that dealt with the sale of EIP was questioned and subpoenaed by the defense. THIS is the defenses defense in this case, that they focused solely on Merritt and made the evidence fit to their theory and ignored all others. Now, I know I'm going to hear 'but he was in Hawaii and it was verified'... my answer to that is, how? what verification was used? It wasn't the paypal records because they just got those 2 weeks ago. And it would not be the first case where a suspect "appeared" to be somewhere that they weren't, or the alternative that they hired someone to do it while they alibied themselves elsewhere. I'm not saying that is the case, but I do not see that they ruled that out either, and it does appear that Dan profited more by the family disappearing than Chase did. ALL JUST MY OPINION!