I would not assume that. In 4 cases, my status-less wife with onward F flight in her PNR has been allocated F when checking in on-line. Meanwhile, I have status and have been flying with her in each instance. However, my onward F flights have been in separate PNRs. Despite status, I have NOT been pre-allocated F seats when checking in, I've had to request it at the airport. This suggests that the system sweeps for onward-connecting F pax, whereas it does not sweep for status (but leaves that to airport control). Mind you, maybe the "system" is merely somebody at DPS who looks over PNRs, hence the process can be hit or miss. Clearly, the best strategy is to have both status AND an onward connection in F.