The research you're mentioning has been done. There is a very slight correlation between September record and postseason record. But a 2-3X larger, though still not hugely significant, correlation between overall record and postseason record.With all due respect. All that literally proves nothing. You would have to do a deep dive into the detail of each of those teams final month. Wins and losses don't tell a complete story. The reality is if you get in, regardless of how you get in anything can happen. I'm sure if i did the research I could find teams that didn't play all that well the final month and still did well in the playoffs.
So you're right. What you do in September doesn't really influence how you'll play in October. Your overall talent level is more indicative. You'd rather be a 95-win team coming off a 12-15 September than a 92-wim team coming off a 15-12 October.
I'll take being a 100-62 team coming off of a 17-12 September