Thanks all for your responses. Here is how I originaly saw it, before I started this thread and read any responses, had Borg, McEnroe, and Connors had all played each while any were still competing. That is excluding ones missed by injuries or physical problems which are just part of the game. These my guesses beforehand of starting this thread:
French Open 1974 : actual winner-Borg. would have won had Connors played-Connors
French Open 1975: actual winner-Borg, would have won had Connors played-Connors
French Open 1976: actual winner-Panatta, would have won had Connors played-Panatta
French Open 1977: actual winner-Vilas, would have won had Borg and Connors played-Borg
French Open 1978: actual winner-Borg, would have won had McEnroe and Connors played-Borg
French Open 1979: actual winner-Borg, would have won had McEnroe played-Borg
French Open 1982: actual winner-Wilander, would have won had McEnroe played-Wilander
Australian Open 1975: actual winner-Newcombe, would have won had Borg played-Newcombe
Australian Open 1976: actual winner-Edmonston(!!), would have won had Borg and Connors played-Connors
Australian Open 1977(Jan): actual winner-Tanner, would have won had Borg and Connors and McEnroe played-Connors
Australian Open 1977(Dec): actual winner-Gerulaitis, would have won had Borg and Connors and McEnroe played-Borg
Australian Open 1978: actual winner-Vilas, would have won had Borg and Connors and McEnroe played-Borg
Australian Open 1979: actual winner-Vilas, would have won had Borg and Connors and McEnroe played-Borg
Australian Open 1980: actual winner-Teacher, would have won had Borg and Connors and McEnroe played-McEnroe
Australian Open 1981: actual winner-Kriek, would have won had Borg and Connors and McEnroe played-McEnroe
Australian Open 1982: actual winner-Kriek, would have won had Connors and McEnroe played-Connors
Australian Open 1983: actual winner-Wilander, would have won had Connors played-Connors
Australian Open 1984: actual winner-Wilander, would have won had Connors and McEnroe played-McEnroe
Australian Open 1985: actual winner-Edberg, would have won had Connors and McEnroe played-McEnroe
Australian Open 1986-beyond: same winners regardless if McEnroe or Connors play the event or not.
So under my guesses it would then change the records of these men this way:
Borg: 5 Wimbledon titles, 0 U.S Open titles, 6 French Open titles, 0 Australian Open titles. 11 total slam titles.
to instead-5 Wimbledon titles, 0 U.S Open titles, 5 French Open titles, 3 Australian Open titles. 13 total slam titles
Connors: 2 Wimbledon titles, 5 U.S Open titles, 0 French Open titles, 1 Australian Open title. 8 total slam titles.
to instead-2 Wimbledon titles, 5 U.S Open titles, 2 French Open titles, 5 Australian Open titles. 14 total slam titles
McEnroe: 3 Wimbledon titles, 4 U.S Open titles, 0 French Open titles, 0 Australian Open titles. 7 total slam titles.
to instead-3 Wimbledon titles, 4 U.S Open titles, 0 French Open titles, 4 Australian Open titles. 11 total slam titles
Guys who lose out:
Vilas: 0 Wimbledon titles, 1 U.S Open title, 1 French Open titles, 2 Australian Open titles. 4 total slam titles
to instead-0 Wimbledon titles, 1 U.S Open title, 0 French Open titles, 0 Australian Open titles. 1 total slam titles
Kriek: 2 Australian Opens. to instead-0 slam titles
Wilander: 0 Wimbledon titles, 1 U.S Open title, 3 French Open titles, 3 Australian Open titles. 7 total slam titles
to instead-0 Wimbledon titles, 1 U.S Open title, 3 French Open titles, 1 Australian Open title. 5 total slam titles
Edberg: 2 Wimbledon titles, 2 U.S Open titles, 0 French Open titles, 2 Australian Open titles. 6 total slam titles
to instead-2 Wimbledon titles, 2 U.S Open titles, 0 French Open titles, 1 Australian Open titles. 5 total slam titles
Gerulaitis: 1 Australian Open title. to instead 0 slam titles.
Tanner: 1 Australian Open title. to instead 0 slam titles.
Edmondson: 1 Australian Open title. to instead 0 slam titles.
Teacher: 1 Australian Open title. to instead 0 slam titles.
So under my original beliefs Connors benefits the most of the 3, then McEnroe, Borg benefits some but the least of those 3 greats. In fact Borg possibly loses out at the French under my original guesses, as Borg was dominated by Connors on all surfaces until 1977, and lost to him 3 times on green clay in the U.S from 74-76, yes not red clay, yes in the U.S were Borg wasnt comfortable playing for awhile, but still 3 straight Connors wins those 3 years on clay.
Still I have enjoyed reading alot of the responses and I am reconsidering my original guesses as I read all the responses. It is good to read explanations of people familar with that period of time, and how they see the different events having played out.