My connection between no FLARE and red AUTOLAND was a little different, sorry for implying otherwise.
FLARE is a logical state in the FBW computers, a branch in the algorithm. There is no clutch or similar, and the software is deterministic even if our bar stories may suggest different.
Hence my speculation that if there were to be an external problem or internal failure preventing the FLARE from engaging, that abnormality would be discovered by the monitoring part and red AUTOLAND flash straight away.
It is a speculation, but goes the other way: as long as you did not get red AUTOLAND, the FLARE will always engage.
Further to the comments above, we do not train for no ROLLOUT and no THR IDLE either.