Heal of Chirrut will often simply not work, however his tenacity up is great vs Vader. You will anyways need Han Solo to outrun Vader (121+56 = 177 speed - no one will manage that speed who has any form of stun).
You could run a massive rebel cc team like that (against typical imp team):
Leader - CLS (kill imp)
Han Solo (first stun on highest threat i.e. Vader mostly, afterwards tear down together with cls the targets)
Jyn Erso (must outrun sion)
Chirrut (must outrun imp and nihilus for tenacity up)
R2D2 (outrun and stun thrawn, cloud etc will be nice for counter attack stuns)
However how good this team will be on defense - i have my doubts. Jyn mostly does AOE and that will be kittens in most cases...as its her special to ressurect and give tm to another. She should better use her single special to remove and get tm and attack short afterwards with her special and assist on cls/polo.
In defense its maybe better to get something like:
Cls, Kenobi, Zolo, R2D2, Thrawn/Nihilus/Chirrut should work inside this lineup too