The correction: physicists don't start with the particle. The field comes first — a particle is just a quantized ripple in that field, not a separate thing sitting on top of it. So the real stack is: the field, then electroweak symmetry breaking (the Higgs field settling into a nonzero value, handing out mass by Yukawa coupling), then gravity — which sits outside this whole framework entirely, unresolved, no quantum version confirmed.
Tier 3 stays visually detached on purpose — physicists don't draw it as a clean continuation of tiers 1–2, because it isn't one. There is no confirmed way to connect them yet.