The whole idea of two people getting PIC for the same flight is that if the aircraft or the conditions under which it is operated requires two pilots then the one manipulating the controls always gets PIC but the other only if he accepts the legal role of PIC, otherwise he is SIC.
Also untrue. There is never a SIC in an aircraft that only requires one pilot- there is 1 PIC, or 2 PIC's. Confusing I know, but the only way a safety pilot can log flight time is if he takes PIC responsibility for looking out for traffic.
No one should have SIC time logged in an aircraft that never requires 2 crew.