No rumors. Just delicious, juicy conspiracies. Bust out your tinfoil hats!
Two members transferred to each SHN48 and JKT48 (and now two from each SKE/NMB to AKB), but only one went to HKT48. Therefore, Aika "alone" is being transferred to HKT now, but it's really a package deal with Sasshi.
Sashihara's scandal was fake. It was entirely planned, with Sashihara's knowledge, and that's why her "punishment" wasn't one. Her move to HKT was to prepare the fanbase, for the transfers + shuffle just announced at Tokyo Dome.