Leno and Letterman offweeks Correlation

Checking the TV Listings, Leno and Letterman (and Fallon) are on repeats this week

Anyone know why the Letterman and Leno always seem to have their repeat episodes in the same week?

Fallon doesn’t always follow this pattern but he does this week.

Kimmel, Conan and Ferguson have new episodes this week.

Please, lets not get into the Leno vs Letterman vs O’Brien vs Fallon vs Kimmel vs Ferguson debate.

I am just interested why TPTB tend to have Letterman and Leno off on the same week.

It wouldn’t surprise me if they do it deliberately because they are in direct competition.

It could also be a leftover from Carson, who they both sorta descend from.

Don’t know but it reminds me of an old “Mad” magazine article from the pre VCR days where someone interviews a TV executive. The questioner says “Is it true that there are only 6 hours of good shows combined on all three networks?” The TV executive says “Yes, which only leaves 2 good hours for people to watch since us three networks always schedule them for the same time. Can’t let the competition get a leg up on you.”
WAG but it could be after 60 years of television, TV executives know, or think they know, just when people will watch TV or not. It’s probably a homogeneous group and not likely to try something different.

Were the networks doing post-debate nonsense at the times Leno and Letterman would be broadcasting? If so then one day would have been preempted anyway.