Early-season BTTS tables always look cleaner than they are, and a 100% hit rate across seven or eight matches is a signal worth noting — not automatically acting on. HPS II and the Icelandic sides Selfoss and Tindastóll are carrying those perfect records into fixtures where defensive organisation is still being settled, rotations are common, and coaching staffs haven't yet found their shape. That's a fertile environment for goals on both sides, but it also means reversion is closer than the record suggests.
The angle here is selectivity. Where two top-ranked sides meet each other, the BTTS case strengthens considerably. Where one of them faces a defensively compact lower-table side, the sample is too thin to override match context. Cross-reference today's opponents before committing — the ranking tells you about past tendency, not tonight's specific defensive setup.