My opinion only but I think Carter learned marketing a bit from Gable. Gable frequently teased he was done after 2021. Carter knows ESPN is a national audience and saying "Beating up college kids means nothing to me now, time to win some Olympic Golds and UFC Titles" He's made numerous references to returning to college, including when he told Flo his plan was 4 titles, Olympic Gold and done and then he told Gabe Arnold "if you can kiss enough butt and get into the lineup next year, I'll take care of you in front of your parents"
I'm pretty sure Carter is well aware how special 4 titles are. He just saw Yianni do it but .... to have a chance to do it SIDE BY SIDE with AB!? Now listen, could they both Olympic Redshirt? For sure they could and maybe we'll punt as a result but I can't see him walking away from that. Now going for 5 assuming he wins 4? I can see him not being interested in that. It's cool to be the "only" one but I think he's aware it might not do much for your legacy to do something that might not truly separate you because does anyone doubt most of the 4 timers could have won if they came back the year after they won 4 and wrestled again? That I can see him being iffy on after winning 4.