The “run to avoid a quorum” trick works if you can leave one person behind to force a roll call to check if a quorum is there. But what happens if the Republicans just don’t call a roll and assume that there are 20 Senators there and start voting on those things requiring a 3/5 quorum? Can they just deem there to be a quorum unless someone demands an actual roll call... but if there were a Dem there to do it they would have the 20 they need? What legal options do the Dems have if the Republicans just start voting things in 19-0 and “assume” that the Dem (there had to have been one somewhere) just abstained? This is what I've been saying all along -- intentionally "miscount" the attendance and officially record it if there are no objections, then proceed with the established quorum.
The reason this wouldn't work in Indiana is that they have enough of a margin to leave a couple of folks behind to raise such objections.