You're welcome.
Thanks for explaining the Bobbi/ biochemist bit.
As far as the cast knowing if Simmons is missing, there's an interview where Elizabeth and Iain were asked what episode they thought Simmons would be found. Elizabeth said the first; Iain said episode 22.
‘Agents of SHIELD’ could take anywhere from 1 to 22 episodes to explain what happened to Simmons | Zap2It