It seems like it something no publisher gets around to asking about what keeps the best players from pairing up. I mean besides what has been stated. Either when it first started to now it seems like everyone kinda skirts around this detail and it just seems to be at the player's discretion.
I mean this article mentions how great of a pairing Morikawa/Wolfe is but they don't ask why more top players don't do it more often or why two top 5 players are allowed to play with each other. Of course they do talk about how chemistry seems to play a part in choosing your partner. So maybe egos are why don't have more top heavy power pairings.
https://www.golfdigest.com/story/pga-tour-zurich-classic-team-strategy-xander-schauffele-patrick-cantlay-collin-morikawa-jon-rahm-justin-rose-henrik-stenson
In regards to the Schauffele(5)/Cantlay(10) pairings-
“I think you definitely want to get along with who your partner is and then you want to grab the best player you can possibly grab,” said Patrick Cantlay, who will tee it up with Xander Schauffele this week.
It helps, too, that they’ve become fast friends. At the 2019 Presidents Cup, Schauffele and Cantlay, each with a sense of humor ranging from dry to sarcastic, bonded over nightly dinners and card games. On the course, they played four matches together, going 2-2 for the week, but scored a key Saturday afternoon foursomes win over Sungjae Im and Cameron Smith as playing captain Tiger Woods sat out. The victory helped close the gap on the Internationals and the Americans went on to complete the comeback in singles the next day.
They’ve been regular practice round partners on tour since."