Daizus, what you need to do is find a reliable scholar that makes the same arguments you make about what Boia says, and cite him or her saying them  in reply to Boia (and not in a dialog that you set up), without introducing weasel words to raise your point from the ground, and without launching into your own theories about how ancient writers used to gather material. For starters. 
As for the rest: you need to find yourself reliable historians that say this and that, cite them saying it, and differentiate between them and Boia, with the knowledge of the fact that you will also allow other criticisms to be expressed. Regardless of my unfamiliarity with the subject, I know that historians of the antiquity in Romania and elsewhere also doubt the identification, and I know that it is prevalent in Romanian historiography for very political reasons.
For these reasons, the merger is POV. Even if the prevalent tone would be that historians agree Dacians and Gatae are one and the same (and I doubt it will ever be), the debate is likely to be open forever, and we need to give readers that information, not the one that suits us.