Chunky, is antpool dedicated to hashnest? why do you assume all its hashrate is from hashnest?
Maybe your math is way off :-)
Antpool has a ph of around 55. That is the combined hashing of Hashnest and all individuals that choose to use antpool.
It doesn't matter if it is hashnest or an individual outside of hashnest if they find the block through antpool that block gets divided between the antpool pool.
To be clear I know all antpool's hashrate is not hashnest. Just like ghash.io was not all cex.io
However, again, when one of antpools contributors finds a block everyone on antpool shares the reward depending on how much they contributed.
Antpool is 55ph about.
The network is 331 ph.
Blocks on average are found every 10 minutes on average +or minus the change in hashing ( varies constantly ) power on the network since the last difficulty change.
You are right... I guess if you average on a longer period numbers will match.