I brought up Fowles because you specifically mentioned in an earlier post that Sims was taking more shots than Fowles. Whereas you did not note any specific forward that should be getting more shots instead of Sims.
The distinction between forward and guard is entirely arbitrary. Moore has always been called a forward. Diamond DeShields was selected for the all-star game this year at guard. They play the exact same "3" position. Even if you stipulate that all "3" players are forwards, that doesn't make a whole lot of sense because 2s and 3s are often operating from the same parts of the court offensively.
Besides all that, it's been proven over and over that you can win with an offense based around guard play..
I mean, you had to call arguably the two greatest teams of all time - Jordan's Bulls and Curry's Warriors "anomalies" to make your point.
And in answering your own question about which guard-dominant team won a championship previous to the Warriors, you completely ignored Kobe's Lakers winning in 2009 and 2010.
And lastly, you may have tried to block it out of your mind but...2018 Notre Dame? That's another championship won by a guard-dominant team.
2007 and 2009 Mercury lead by Cappie and DT...the list goes on...
Feels like it would just be easier to say "Collier needs to shoot more" instead of making a faux-historical argument about which teams can and cannot win championships.