BCH Mempool is 1.6Mbytes, so it's over the 1M threshold to trigger the fork when the block is found.
THE FUN PART:
Bcc forked at wrong block. No full mempool.
That means their code is faulty and will continue to fork
or they did some offline trick to make "orphan" to continue their own chain.
Trick or fail, that can be only solved after their first block.