Yeah, I think the ideal setup is two-tier.

extremely lazy, large model

        +

extremely diligent Ralph

Not sure if top model should be the biggest one though. I hear opposite opinions there. Small model which delegates coding to bigger models, vs big model which delegates coding to small models.

The issue is you don't want the main driver to be big, but it needs to be big enough to have common sense w.r.t. delegating both up[0] and down...

[0] i.e. "too hard for me, I will ping Opus ..." :) do models have that level of self awareness? I wanna say it can be after a failed attempt, but my failure mode is that the model "succeeds" but the solution is total ass.