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It really depends on how much hashrate they get. If Bitcoin Cash starts at 20%, it will only be solving blocks every ~50 minutes and the blocks will have to be larger, but probably still less than 8MB. The more hash rate it gets, the smaller the blocks will be.

If they are not completely dump they will recalculate difficulty in advance.

i dont think they would even fill 8mb very often, especially as a fork. But i also do not think that 8mb is too large. I can walk around with a phone and stream 4k, but i cant have server that can accept 8mb per 10 minutes? Cmon!

Its simply Greed and fear .High level manipulation. Bitcoin investor said he is shifting to Bitcoincash and immediately coin moves skyward.