JJ,
None of the questions you ask have relevance here, and there is nothing HTBT about it. The crux is that R2 did not advance, and B/R could not have reached second safely with or without obstruction, because 2nd was occupied.
It's a common occurence: A hitter is held to a single because the runner on second fears the ball will be caught.
The penalty for type B obstruction is not awarding bases; instead it is whatever penalty would nullify the act of obstruction. In the OP, if there had been no obstruction, B/R would have to stop at first--because R2 did not advance. So the umpire nullifies the act of obstruction by leaving him at first.
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