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[Star Wars] Say Vader doesn't strike Obi-Wan down or make him more powerful than Vader can possibly imagine. Then what?

Say Vader heeds Obi-Wan's warning, and instead of killing him, roundhouse kicks Obi-Wan out of the corridor and let's him go, where he is free to escape with the others. Is he now less powerful than he would have been if he had been struck down? Would the rebellion have been worse off? What happens next?
gpt
The Falcon is still allowed to escape to lead the Death Star to Yavin, and Obi-Wan joins the X-Wing squadron flying to attack it. 

He uses the Force to guide his own torpedo down the vent shaft, while Luke only watches as his wingman. 

Over the next few months, Luke continues to be trained as a Jedi, but always wonders why Obi-Wan won't talk about his history with Vader and his father Anakin. Also why he keeps shutting him down about this crush he has on that princess.

Again Vader finds out Luke is his son, and manages to communicate with him privately, away from Obi-Wan. Luke, having seen Vader show mercy when he spared Obi-Wan on the Death Star, talks with him. 

The Emperor soon has a new apprentice.