A
Wouldn't mind seeing him and Mighty Mouse square off again.
Since Johnson has no intentions of moving up for now, it should be the Assuncao/TJ winner, provided they win clearly and aren't too banged up.
Plan B would have to be Lineker? I guess? If he KTFO's MacDonald, I wouldn't hate that (wouldn't love it either though)
Mighty Mouse would be the best choice, but he has two other fights scheduled right now lol.
I would assume if Mighty Mouse wins his next fight he has no other option but to move up. I think Garbrandt is close, but I also think he is a potential superstar in the making and I'd assume they'd like to get him one or two more fights to gain some more experience and build a bigger fan base before throwing him into a championship fight with Cruz.