I suppose you could look at it as getting it out of the way. I would be inclined to agree with that, although he already was “some guy”, so there was no mystery to begin with, not a real one anyway. I agree that he had to have character growth (learning to trust droids), but, as I stated, was a quick 180
Well, if he didn’t trust droids after those sscenes then he likely never would. OTOH, maybe he just trusted that one.