When he finds Bunda in the final moments before the serum takes hold, he begins to wrestle with what he has done. “I fucked things up pretty good,” he says. “This was the best I could come up with.” It’s unclear whether he believes this plan really was the best or just the easiest to pull off in the hours before the party. Maybe, he like his workers, was just happy to follow someone else's lead for once. Either way, he must now live with this decision that will leave them shells of their former selves. That's not what his intention was with the berries, but Leonard never really says what his big plans for the serum were.