I’m not sure I quite understand this theory. Are you implying there are two suspects at play, and law enforcement created the “new sketch” from the audio?
I believe we have two wide range of sketches for a combination of factors: proximity, age of witness, simple recollection of not “needing” to memorize physical features, etc. Both being sketched via LE on account of at least two “BG” witnesses shortly after the crime.
As I mentioned earlier, I think it’s interesting LE was looking for a possible “hitchhiker” at one point. Because if there were (at least) 2 “BG” witnesses, this could help explain the vast differences in sketches. For instance: maybe one witness saw him in passing via a vehicle and the other witness saw him closer, both being on foot, and was able to collect different physical characteristics. The sketches have likely caused more harm than created good.
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I’ll also add: I’ve never seen LE asking for follow-ups regarding the potentially abandoned bag, hitchhiker noted above, or vehicle located at the CPS building. Maybe LE found their answers. They were on to something early.