Eurus Holmes is an era-defining genius…beyond Newton.
When John was visiting his “new” therapist, he stated, Molly Hooper was the only person who could really see through Sherlock’s “bullshit”. Eurus heard this loud and clear.
Eurus knew Molly would make Sherlock say “I love you” first. She knew this woman would be the one to put her brother on the back foot in a very, very big way.
Eurus essentially took all of Sherlock’s power away in front of Molly Hooper. She empowered Molly over the man she loves by putting that situation in front of her. There was no bomb, never was. It was all about Sherlock, yes…but it was all about how powerless he really is in front of Molly. Emotional context.
Molly Hooper is not weak, she is a lion. Her love is not weak, it is unbreakable. Her love is not meaningless, it means everything. Sherlock’s love is not meaningless either, it means everything. Eurus proved it. That was The Final Problem.