Completely agree - all this "chemistry" stuff just seems like a just-so narrative for a slide that started before the Turner trade piggybacking on a desire to yet again indulge in the "Perk trade cost us a ring!" line of wishful thinking.
You've hit two of my pet peeves:
1. Psychoanalyzing other posters and assigning them motivations. Unless you're a mind-reader, this seems inappropriate.
2. Posting "facts" that aren't really true. The Pacers were 7-3 in their 10 games prior to the Turner trade, with a margin of victory of +6.7. They were 7-3 in the 10 games before that, as well. I think it's hard to call that a slide; a .700 win percentage projects to 57 wins. It's certainly a far cry from the 12-13 record they had post-trade. Of those 12 wins, 10 were against the Bucks, Lakers, Celtics, Jazz, 76ers, and Pistons.
So, yes, they were a completely different team post-trade.