How important is deal analysis if I will be paying off in less than 10 years

[Jim Vasica]

I am 46 and planning to purchase 5 total properties over the next 4 years, After they are purchased I will be using my own money (W2 job) to pay them off and retire early. How important is cash flow and COC return now if my plan is to use my own money to pay them off, My theory is with the amount of interest i will save on the loans by paying them off early i will be saving. Am I thinking about this correctly or am I missing something?