Leon did not personally follow up on the Sentry Program. He merely summoned Valentina to his office from time to time to test her loyalty.
Under normal circumstances, Arcee A2 and YoRHa 2B, the sisterly pair, handled most of it alongside the Transformers Leon had stationed everywhere around Valentina.
At the very beginning, when selecting personnel for the Sentry Program, Leon displayed a little grace and humility toward worthy talent.
He "happened" to encounter Bob Reynolds, who had broken into the laboratory to steal drugs for free, and after subduing him on the spot, Leon not only chose not to hold him accountable but also saw infinite potential in him.
Of course, all of that was just nonsense Leon had made up on the spot to fool Valentina and the uninformed people.
In short, Bob Reynolds was moved by Leon's "sincerity" and was destined to join Valentina's Sentry Program.
Leon also took the opportunity to sign in beside Bob for several consecutive days, but the rewards were always white powdered drugs.
Leon gave them all to Bob and let him work through them slowly.
As long as they didn't kill him, he could take them until he dropped! Leon had plenty!
Those were Leon's exact words to Bob.
Bob was instantly won over by Leon, who was greater than God in his eyes. He became Leon's loyal fan and resolved to become a superhero, join the Avengers Alliance, reach the pinnacle of life, and achieve complete freedom to take drugs.
Leon did not want Bob to gain power too easily, so he did not speed up the formation of the Sentry Program. The so-called Sentry Serum was still nothing more than a newly created folder.
Because of the storm stirred up by Leon, this Butterfly, Bob joined the Sentry Program