Until the NCAA develops NET for baseball, RPI is what they have. I’m sure the committee looks at a lot of other things but college baseball doesn’t have a lot of analytics and power ratings like hoops does. It probably doesn’t really mean anything until May 1.
Southern Illinois is #1 RPI right now; they played a weekend tournament at Jacksonville State (including a road game against JSU) and went 3-0; the other three teams are RPI 6 (Tennessee Tech, who might actually be decent; you remember a few years ago when TTU hit like 840 home runs), RPI 17 (Jacksonville State) and RPI 19 (Alabama State). The chances that Alabama State is going to be in the top 20 RPI in May are approximately the same as my chances of getting a date with Scarlet Johansson Friday night.