My take would be :
What do you think ?
Molly has access to drugs and corpses and Holmes had asked for her help.
Holmes threw a corpse from the roof - either one supplied by Molly or Moriarty.
The crowd around the body were the Homeless Network / Baker Street Irregulars who were in on the plan.
Watson was delayed by the cyclist to allow Sherlock time to get downstairs, into the crowd and replace the corpse.
Sherlock slowed his pulse (using drugs from Molly ?) to fool Watson, saving his life.
The corpse was buried as Holmes.
Holmes threw a corpse from the roof - either one supplied by Molly or Moriarty.
The crowd around the body were the Homeless Network / Baker Street Irregulars who were in on the plan.
Watson was delayed by the cyclist to allow Sherlock time to get downstairs, into the crowd and replace the corpse.
Sherlock slowed his pulse (using drugs from Molly ?) to fool Watson, saving his life.
The corpse was buried as Holmes.
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