How about this scenario:
The patent is rejected 3/28/17
AVXL receives great results from BIIB's MTA. Talks with BIIB bear fruit and a plan is hatched.
AVXL requests re-consideration of the patent with expanded use in MS in combination with BIIB's drug.
Patent is approved around Sept 1st.
AVXL/BIIB partnership is announced Sept 11th.