proof, Portico after DB is just Dougli Block, the last layer, COLL + EP5 is variant that is proposed along with the original proposal, which predates Portico.
I'll give you that Portico is a sort of HK Variant, but HK is a ZZ variant making Portico and HK ZZ variants.
then Portico along with the other many HK variants are HK variants which in turn is a ZZ variant., so Portico and others is a sub variant, IMO