D2 or D3 schools would NOT be competitive in the power five conferences. They might win a few fall scrmmages, but that's a far cry from being competitive over a full conference schedule. Mid major conferences, sure. SEC, Pac 12 or Big 12. No way.
There are almost 400 division 1 softball programs out there of which you are accounting for about 40. Lets even say, yes, the top 100, 150 even, are out of the league of solid D2 and D3 schools but that still leaves a lot of room for comparisons.