Sentence Correction

After having bumped David's excellent post, The Truth About Changing the Meaning in Sentence Correction, it got me to thinking about a few things they're saying over at Aristotle Prep. Based on what they're saying, I wonder if perhaps there has been a change in scope of sentence correction questions on the GMAT which are not reflected (or are under-represented) in OG12? Aristotle's claim is that multiple grammatically correct answer choices may be distinguishable only by their meaning relative to the original sentence. Now, granted I have not yet made my way through all OG12 SC questions, but I have yet to encounter this situation. Perhaps it does exist? Either way, though, it seems to be getting disproportionate (relative to OG12) attention by some prep sources ...

Their statement:

Over the past few months, one aspect of the feedback has been surprisingly consistent - the Sentence Correction questions were very different from those that students had practiced in the Official Guides and other practice material. This feedback was consistent irrespective of the score that the student eventually ended up with - a 500 scorer felt this way and so did a 700 scorer. A lot of the students also reported that they did not get too many (in some case none) idiom questions and that they found it very difficult to split the options.

These were some of the salient points of the feedback:

• * One or two (in some cases none) questions testing the knowledge of idioms
  * Not possible to split the options in several questions because all the options were different
  * More than one answer choice was grammatically correct
  * A lot of questions had difficult to spot errors such as fragments and runons

As a result, the "new" SC prep guide seems to contain questions with two grammatically correct answers, where their OA is the answer most consistent in meaning with the original sentence.

EXAMPLE from their sample new question bank:

3) The acclaimed writer said that his writing, which were powerfully influenced by
storytellers in its family and that the landscape of his childhood also shaped his
thinking and provided themes for his stories.

(A) his writing, which were powerfully influenced by storytellers in its family
(B) his writing was influenced by powerful storytellers in his family
(C) storytellers in his family powerfully influenced his writing
(D) storytellers in the family being powerful influence on his writing
(E) powerfully influential in his writing were family storytellers

Now, in this case, B is grammatically correct but is said to change the meaning of the question too much to be a correct answer. Here is the relevant snippet of their official explanation:

B does not have a grammatical error but distorts the meaning of the original sentence by using 'powerful' as an adjective to modify 'storytellers'

C is the best answer

I tend to agree. Because the family had a powerful influence on him (as stated in the original sentence), it doesn't mean they were powerful story tellers. However, doesn't this seem to bring a new dimension to sentence correction questions? It seems to me that in the past, as David's post indicates, we have not expected to see two grammatically correct answer choices whose salient distinction is their meaning relative to the original sentence. Maybe I'm incorrect in that assumption. So maybe the distinction between "changing the meaning" and "distorting the intended meaning" needs to be clarified?

Curious to hear further expert feedback on this.

Thanks!