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Lestrade can't believe this, won't believe this.
But it sounds so tantalizingly possible, and he can see why Donovan and Anderson believe that Sherlock's a fake. Lestrade, though, he'd never doubt Sherlock. He knows him too well – Sherlock never did any cases for the fame, to be a good person, to help the police.
No, he did them because he was bored. Because he enjoyed solving the puzzles that elft the rest of the world baffled.
Lestrade's with the police, and he has no choice.
He calls John, lets them know that they're coming.
It's the least he can do.