It's always dangerous to talk about things in extremes, Nickkk. Saying something like "a center who shoots threes will never win a championship while starting" is short-sighted, and as of the past couple years-- not even wholly accurate. Basketball isn't black and white. There isn't 'one-way' to win a championship. The Pistons won theirs with no stars. The Bulls won theirs with no elite two-way bigmen. The only thing that seems to be 'consistent' among champions is elite defense, and dependable offense both in terms of starters, and bench. Whether the PG is combo or pure, whether the wings are 3 and D or the main options-- all of these things will have variation from year to year. So it's intellectually incorrect to assume that a certain construct (based on recent history) of what a basketball team should look like, should be adhered to, and any deviation from it is bound to never win a championship.
I'm all for trying new spins. PFs that stretch the floor CERTAINLY aren't new to the game-- in fact, one in particular has arguably won championships for multiple teams from his clutch shooting (Big Shot Rob). As far as centres are concerned, well: Memo's shooting made one of the Jazz one of the best offenses in the league-- and it would be dishonest to suggest that this three-point shooting is what made him a poor defender. You've been sticking adamantly to this correlation of three-point shooting centers as poor defenders-- but your reasoning behind this correlation has been spotty.
tl dr : Just because there seems to be patterns of success in the past, doesn't mean that a) it is absolute; b) it should stop us from continuing to innovate basketball, and find new quirks that could help a team be a step ahead, bringing it closer for the ever-elusive NBA championship.