All three pieces are really about the same thing: who owns the substrate that everyone else runs on, and whether that ownership shows up in the financials yet. Pope's gate-level analysis explains why architectural lock-in is real and durable. Amazon's SDK play is that lock-in executed in real time against retail. Anthropic's cap table is what it looks like when even the memory suppliers decide the substrate owner is worth financing — before the S-1 tells you whether the revenue holds.