“…IIRC, no insiders have bought in the market, in support of the SP, since then.”

I believe you’re correct. Two possible reasons for that: either (a) they don’t think it’s worth it to buy on the market or (b) insider knowledge of what’s coming down the track precludes them from buying on the market because to do so would break the law. I’m presuming it’s (b) although what they know may not include knowledge of what speed the train is travelling at.  Maybe even Ernesto doesn’t know that given his comment about “Teck is moving fast”.  At least the converse is also true; they’re not selling either.