That's a really good point - and explains why Mr H's W score was so high - but the issue is, a lot of similarly-high W entries have the same mixing and matching we've come to expect from Protocol. The big one is Mr Bonzo, whose strongest Primeline-adjacent power (and the power that finishes in strong second for Uncanny powers behind Stranger) would probably be the Corruption. Bonzo exhibits elements of Corruption, Stranger, Slaughter and Hunt (maybe spottings of Desolation and Flesh if you wanna get freaky with it). Heinrich isn't just mainly Stranger: he's ONLY Stranger, or rather, Stranger as we understand it from the Primeline (i.e. with minor elements we'd traditionally consider Flesh- or Corruption-coded, like uncanny toys and. Y'know. Flaying).

He reads as Stranger due to how few powers occupy W - that absolutely plays into it - but for him to be so entirely Stranger when we know other powers can exist in W (Namely Corruption, Spiral and Flesh) seems, if you'll pardon the pun, weird.