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On https://btc.com when you click on about us it takes you to the Bitmain's website. Basically Bitmain is BTC.com. Also as we know Bitmain runs Antpool.
That means that these very recent 12 blocks were mined in a row from 1 source.
This excludes btc.top and viabtc that as you know has shown that they are heavily influenced by bitmain, if not in the end just a front to make the hash power seemed more spread than it actually is.
If there is any merit to the above statement then other than the 1 unknown block 20 consecutive blocks were mined by 1 entity or by a group that is controller mostly by 1 entity. And all of this is just looking at the most recent blocks, I am sure you can find much longer consecutive blocks mined.
If you are buying a house with Bitcoin rather wait for more than 20 blocks before you assume that the transaction is legit.