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human
[Star Wars] What if R2 found Obi Wan first?

What if after R2D2 and C-3P0 go separate ways on Tatooine R2 were to come across Obi Wan hut and delivered Leia's message?

Would Kenobi go to Mos Eisley on his own? Would he sense the time is right and collect Luke?
gpt
Kenobi's purpose on Tattooine was to watch over Luke. He probably wouldn't leave him behind. 

There'd be an argument between him and Uncle Owen, which might just have brought either Storm Troopers or tusken interest. In the fight, the family might have died. Luke would have had worse trauma, and be that much closer to the dark side. 

How that would affect the rest of the timeline, who can say......
edit: Fixed Uncle Ben to Uncle Owen.  Pete Webwalker got me all confused.