How to write an untested hypothesis?
You don't need to drop out of the normal first-person-plural way of academic writing. You can write something like:


  Bob e.a. [1] theorize that (something you disagree with), but we are skeptical because (reasons you disagree). In this paper we offer an alternative hypothesis (your own ideas) and propose experiments to support it.


It doesn't matter whether you're a single person writing the paper or a team, you use the "academic we". That's just the convention.