I think in this social media age people are too easily given to conspiracy theories and allow their hearts to rule their heads too readily when evaluating them. I don’t doubt some widely held conspiracy theories hold considerable truth, but I think one has to try and apply cold logic to them. For example, the fact the moon landings were fake simply doesn’t bear any logical scrutiny, given the number of people involved and the passage of 53 intervening years, but on the other hand the notion that LHO assassinated JFK is highly unlikely, given all the circumstances of and around that killing.
On that basis, I believe that Truss’ elevation is likely to fit broadly with your theory. She was that poor, that inept, and made that many egregious errors that it is simply impossible to escape from the notion thst this whole thing wasn’t planned to a significant extent by Johnson and those that support him. Her rise to one of the great offices of state was precipitated by Johnson and it’s certainly entirely conceivable that she was deployed as a tool to get him back into power quickly. Certainly, once she was put to the members it was a shoo-in that she would win against a more moderate candidate. That vote was never in doubt and therefore if the process could be manipulated to that extent, the outcome was guaranteed.
Any objective observer of this person who was manifestly so ill-equipped intellectually and temperamentally for the office of Prine Minister cannot completely dismiss this notion, given how events have unfolded, especially if Johnson regains that Office so quickly and grotesquely.
Something about all this doesn’t add up. She really was that bad.