Sure you need a top 5 player. Landing that guy comes down to luck either way. Either mid to late draft luck by picking the right guy, or lottery ball luck.Do you know what's the commonality between the Bucks and the Nuggets? They both drafted their MVPs in the draft... and both drafted them way outside of the top 10. They didn't become great from the middle because of trading for Jonh Collins or Kelly Olynyk types... they became great because they picked MVPs in the draft... and then built around them. The hard part is the MVP part. A while ago I went back about 30 years in the past and looked at all the NBA champions in that timespan. I think only one or two didn't have an NBA MVP on their roster. If you have faith that we can get an MVP level player drafting in the middle.. then... sure... lets do it. I would always go for as high of a pick as possible... especially in drafts with clear generational talents.
But you need a good team around him as well. Thats where more fails happen each year, as usually there arent 2 top 5 guys in the same team (KD-Steph Warriors excluded). So usually at least 4 of the top 5 fail to win every year.
Again, when you did all that research and formed your opinion I'm sure you also found at least 1 deep tank championship team.... right?