Sorry we do not support any of these workflows with the web forms. There can only be one filler per response and there is no way to link two forms together.
If you distribute the PDF form then you could have one person filling one part, save the form with partial data and send the PDF to the second filler who would complete the form and submit the data.
We have conditional fields on the form and we do not want to lose that but we might have too, Any changes planned here?
You are right, conditional fields are web form only.
What I would suggest is to browser the different feature requests here :
I know similar features have been requested in the past.
You can also submit a new feature here :