Lebron James wasn't drafted by the Heat, Chauncey Billups (that all time legendary franchise player) wasn't drafted by the Pistons, Kevin Garnett wasn't drafted by the Celtics, Shaquille O'Neal wasn't drafted by the Lakers, Shaquille O'Neal wasn't drafted by the Heat, Pau Gasol wasn't drafted by the Lakers, Dirk Nowitzki was drafted 9th by Dallas, Kobe Bryant was drafted 13th by the Lakers, Tony Parker was drafted 128th by the Spurs.
Your hard and fast rule about a team needing to tank and draft a transcendent player to ever have a shot at an NBA title seems to have more aberrations than it has championship teams that fit your rule.
I guess you can alway fall back on Tim Duncan as the player that fits your absolute rule of how champions are built. Or, you can rely on your vast mountains of evidence from back in the olden days. Or, you can try to turn LaMarcus Aldridge, John Wall, and Al Horford into players that are destined to be all time greats based solely on their respective draft positions.
Or, you can admit that your theory is highly flawed and outdated.
Tanking is not the way to rebuild this team into a contender. Somewhere in the back of your mind you probably know this, though.