#2 Wants back - Cody
I think it's clear by now that Vince McMahon definitely regrets letting Cody go. Since his departure from WWE, Cody has ascended as one of the top pro wrestlers, not in WWE and is now one of the executive vice-presidents at All Elite Wrestling.
Imagine, if WWE had never allowed to let Cody leave in 2016, there would probably have been no All Elite Wrestling.
Corey Graves deleted his Tweet! More details HERE.
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#2 Doesn't want - Big Cass
WWE reportedly had big plans for the Cass but it was his backstage attitude that let him down. Vince McMahon himself was reportedly unhappy with Cass' after unprofessional conduct on a tour as well as reportedly no-showing a promo rehearsal and later messing up the said promo.
Producers backstage were also reportedly unhappy with how Big Cass' feud against the big show had gone. Then, there was also the incident where Cass went against backstage orders and hit and kept attacking a Daniel Bryan impersonator after he was on the ground.