Drafting detail support?

Has anyone read on a Zwift tech area the answer?
Two cycling in line, say 28km/hr. Neither on TT bikes. Obviously the rear bike Benefits from a draft as Zwift tells you on the GIU. So, what about that bike in the lead? They don’t see a zwift draft message, that’s for sure.
Will the lead Need more, same or less power to support the drafting behind.
Again, looking for facts not gut feel or innuendo.
Thanks in advance 

You will never know. Zwift does not make the formulas public.

If you want to know what we observe: The front rider in not impacted.

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