I am pretty confused by your blog. As the others have written I do not believe that these results "discredit some of the love USL has been getting lately" if anything the fact that USL can roll teams like the Impact did to Joe Public and sit on top of their group reinforces the fact that the gap between USL and MLS is not as wide as imagined. Until MLS raises the bottom level salaries for the "depth" players as you refer, I actually think USL teams have more depth. I can not think of anyone who would disagree that the Impact have more depth, if not necessarily talent, than their neighbours Toronto FC.
If you think missing three sitters is a travesty try watching an EPL match between two bottom table teams. Assuming they will be able to even create sitters, odds are they will miss many of these chances.