Well, let's think about what the goal is and what the options are. First the options.
Fiz can decide to go with 2 defense minded PGs [DD], 2 offensive minded PGs[OO], or 1 defensive minded and the other offensive-minded[OD].
The model and rationale for DD might go something like this: The PG should facilitate making everyone else better - the benefit is that the scoring will remain in the hands of those we traded for *to score* and keeping the other team honest means closer, more winnable opportunities.
It also means the four on the floor have consistent expectations offensively and defensively. They will always get theirs first. Less thinking, less stress, less unpredictability.
This option also speaks to load management. Getting Barrett opportunities to rest periodically can mean either sitting a game out or playing third string PG situationally. This opens up minutes at the two/three and gives Fizdale the opportunity to saturate a lineup with offense when defense isn't the issue.
The DD also gives Fizdale a firewall from criticism. PGs who manage the floor on both ends better are less likely to create or expose embarrassing weaknesses. While the PGs may be light scorers, its a given not an exception. Tweak the offense.
The model for an OO PG strategy is that it emulates a D'Antoni strategy - sporadic defense but win by scoring as much as possible. Your fans will need an appetite for porous defense [given our current roster] and sloppy games.
This may be the worst way to develop young players if you ever expect two way players to emerge. PGs will inevitably be accused of selfish play and selfish play can be contagious.
The OD model *sounds* balanced but almost requires dual squads. Interjecting a defensive PG can be less disruptive that injecting an offensive PG in play. It introduces uncertainty of the role players expect to assume. "We were executing one way, now what". It also introduces counter move cycles so that player mixes are unnatural. More likely to add confusion and second-guessing.
If I'm coaching, I like a DD tag team. Put your trust in the PGs to deliver the goods. My attention can focus on matchups and adjustments elsewhere. I'm building up good habits. My scorers are getting their stats, building value and maybe demanding NBA achievement considerations.