Think everyone here is too focused on WF and KW3 and not considering outside influences.
KW3 has been home in Tennessee for more than a month. When Walker initially opted out, he posted on Twitter that he would be back. It's not like KW3 suddenly woke up in January and felt like he wasn't getting enough carries or didn't like the RPO. College football is dirty dirty. You can bet that messages have been sent by multiple programs through intermediaries (e.g., HS coaches, HS teammates, any other connection) suggesting that KW3 enter the portal so that competing schools can directly recruit him. These schools aren't dumb enough to text or call KW3 directly, but they have ways of communicating with players to skirt those rules. Guessing KW3 has been recruited for awhile and based upon that, he decided to explore his options.