Your assumption is incorrect. Swedish helicopters dropped off their survivors at Utö. AFAIAA only one helicopter carrying nine and apparently one carrying one, went direct to Huddinge.
One guy named Altti, who lives in Stockholm, says he was in one of those helicopters, although not put on the list. He says the helicopter stopped in an airfield and all kinds of weird things went on.
Helsingin Sanomat 1.10.1994 reported Danish and Swedish newspapers saying Piht had gone missing from a Helsinki hospital. That makes sense, as he may have travelled with Bildt, Aho and Laar (the Prime Ministers of Sweden, Finland and Estonia) when they flew to Turku to interview Sillaste (and probably Piht, too) and Piht then flew to Helsinki, on the same plane as them, where the JAIC was set up.
HS