Also, I think the section regarding TechStars success makes an assumption mistake:
"The national rate of failure for startups is 75-90%. So lets say it was a good year and Techstars Chicago received a 1000 applicants/startups to choose from. You know based on national averages that 750-900 of these companies will fail. That leaves 100-250 that will succeed. Techstars is only taking 1% of applicants, which is 10 startups. Unless Techstars is picking poorly, they are selecting companies that are positioned for success from day one. These startups would most likely succeed with or without Techstars."
The common assumption that 75%-90% of startups fail is usually regarding venture backed startups, not people who fill out the TechStars applications. I would wager that the if you looked at the failure rate of anyone who had an idea they wanted run through an accelerator, the failure rate would be much, much higher. What you should benchmark TechStars against VC performance.
(Disclaimer: I went through TechStars.)