Just one simple issue reverses the ignorant "reversal" touted above: A team of 5 five people who have to maintain bilateral, substantive communications with 4 others, has a total of 20 paths of dialog to maintain, so the project can be completed in five months..
For a team of 25, there are 25*24 paths: A total of 600. And, only one month.
So, FIRST, you have 5 programmers with 20 total dialogs going on, and it endures for five months. The alternative offered is 25 programmers with 600 paths of communication, and it all has to be done one month. When do you do YOUR thinking?
If you can't see the fallacy in that comparison, you are a typical, incompetent "business manager" who's can't write the BASIC program to print "Hello, World".
Fred's empirical observation still stands, to this day.