Why would they go to Impact. They are a sinking ship
Ultimately, I think its cause of Japan. I think both realize that their best option is in Japan but Anderson (maybe Gallows) dont really want to pick up and move to Japan again. On top of that with the pandemic going on it may be hard for them to sign with NJPW and have to travel in & out of the country. This way they get to work & get a check and when the option arises, go work in NJPW as well.