I don't have a lot of confidence that those numbers are true (10 DOSC for him, a few dozen for his students), considering the source. 

Always consider the source.

And here in Chicago I always check my favorite local homicide tracker whose name violates usage restrictions.Is there other favorite metrics out there that I am missing? 

Other sources may get you leads but more don't pan out in my experience.   

Again, cloned teak are generally from the same mother tree source or a couple of trees. 

My point is cash flow is only one source of return on RE and in my opinion the least desired because it gets taxed annually.  

I just read an article recently that noted "Avg Profits For Flipped Homes" of $80,000, however when you dig into the article and their sources, "Profit" is simply Sale Price - Purchase Price...so it doesn't consider renovation costs, holding costs, financing costs, etc.

Made that up, no data source. 

Explore my personal favorites, Set For Life by Scott Trench or The Total Money Makeover by Dave Ramsey, for invaluable financial insights.3.

The only source for all the local information needed is an experienced local team.