I suspect Waynes will be gone to the Raiders. Mayock knows Viking personnel and he knows he's not going to get the quality of cornerback that he can get with Waynes with the 27th pick. With the savings in cap space, Zimmer will be able to resign Richardson. Barr is gone...we just can't afford him.
That said, I think the Vikings will go Bradbury at 18 and swing back around at 27 with Risner. Now, you might think I'm crazy, but I don't think Rick will be done there. I could see him going after Cajuste or David Edwards, each of which could play inside or RT. So, with trading Waynes, I believe Rick will draft 3 OL in the Vikes first 4 picks (rounds 1-3). With the decision to draft OL, rather pay big bucks for FAs, The Vikings could allow Barr to walk and capitalize in Comp pick(s) because he'll demand a huge contract. If he decides not to bolt, the Vikings 'might' afford to keep him since they didn't spend huge bucks on a Roger Saffold or similar free agent.
We can take the hit losing Waynes much easier than any other player. Hill will be another year more experienced and Hughes should be back sometime during the season.
2019
LT - Reiff
LG - Risner
OC - Bradbury
RG - Edwards (I really like Edwards at RT long term)
RT - O'Neill
Reserves - Best of Elflein, Easton, Collins, Hill, Bisnowaty
2020
LT - O'Neill
LG - Risner
OC - Bradbury
RG - Elflein
RT - Edwards