UFC heavyweight fighter Stefan "The Skyscraper" Struve recently spoke to Submission Radio and said that he would not like to see Brock Lesnar return to UFC to fight Jon Jones because he doesn't think Lesnar should be allowed to return to UFC:

“I think cheaters should not be in the UFC and I think the UFC made a big mistake last time by bringing Lesnar in and giving him a four-month exemption before his fight so that USADA wouldn’t test him for four months, which is a normal thing to do if you bring back a fighter. I believe that if he were to come back now he would have to go through six months of testing. So I’d be very curious how those six months go. I think Jones beats him anyway. Simple as that. Jones is too good of an athlete. I don’t think Lesnar gets a hold of him to take him down. Jones moves too well.”