No, you misunderstand the context in which I wrote this.
In this particular situation, you have a boundary condition where the Cajun softball team has a perfect non-conference WP. Because of this, losing a single game does much more damage to the non-conference WP than it typically would (and therefore the non-conference RPI). The same held true for the overall WP (and RPI) before the loss to Troy. At this point, the Cajuns are probably better off if they do not schedule any more non-conference games. Although McNeese State will be a nice add to the non-conference RPI, provided the Cajuns win. This is why, in this particular scenario in the context of RPI, the lone remaining non-conference game is the most important remaining game on the schedule.
Now, speaking strictly from the standpoint of your RPI value/calculation, there is no difference between non-conference and conference games. Winning/losing a conference game vs. winning/losing a non-conference game results in the same WP. That is, if you win a non-conference game and lose a conference game, your RPI will be exactly the same as if the scenario was reversed.
Now, leaving aside non-conference RPI as a calculation ... non-conference RPI as a selection criterion has a certain value in the selection process. For Cajun softball, I think it will have a special meaning because it will be a barometer in establishing their worthiness in obtaining one of the Top 16 seeds and a potential Top 8 seed. Cajun softball is not concerned with simply obtaining an at-large bid. There are more important things at stake here ... and non-conference RPI will be important in measuring the Cajuns among the elite teams since the Cajuns do not play in one of the power conferences.
With Cajun baseball, non-conference RPI plays a less important role in a typical season. It still obviously plays a role in the selection process for at-large bids. But Cajun baseball is usually concerned with (in the running for) an at-large bid during their good seasons, not a #1 seed or National Seed. Thus, they are typically more concerned with conference positioning, as it is a demonstrated trend that conference champions earn at-large bids (in nearly every season) and those finishing #2 or #3 have a solid chance of earning an at-large bid (though I doubt that will be the case this year). Thus, from a selection criteria standpoint, conference finish ... and by extension conference games ... are more important than non-conference games. If Cajun baseball was in a season where they were winning the Sun Belt comfortably and in the running for a #1 seed, I would feel that non-conference games should receive more emphasis.
Brian