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[802.3_100GCU] why transmit all parity bits after 20 data blocks in FEC frame?

Dear all:

in page 10, the fec frame contains 10 Reed solomon encoded blocks. each blocks contains 514 original data bit and 14 parity bits.

But all these 14*10 parity bits are transmited after all 514*10 data bits. I think this leads to large latency in fec decoding, because decoding  the first 514 bits can not happen before its 14 parity bits arrived.

So why not transimit 14 parity bits with their corresponding 514 original data bits?