it's true F.Kuzmich and Alexander I was the same person,?(it was also theory of GD Nicolas Michajlovich-)
According to Troubetzkoy (p 242). G. G. Nikolai Mikhailovich's research brought a result
against the legend. It was other persons who apparently claimed that the G. D. was forced by his Imperial standing to maintain such a position.
Troubetzkoy expressed his hope that the tomb in the P. P. Fortress would be opened to reveal the truth.

The author provides the possibility that Feodor Kuzmich was the illegitimate son of Paul 1, born to Sophia Chertorzhskaya in 1794. This contention was previously advanced by G. D. Nikolai Mikhailovich.