Why has Blockstream omitted putting their corporate name to the roundtable document? Are they not proud of it?

https://medium.com/@bitcoinroundtable/bitcoin-roundtable-consensus-266d475a61ff#.4aatlp4m1

As at the time of posting there is no signature for Blockstream.

Adam Back has signed as "individual". So why are lots of other Bitcoin companies represented except the one which employs 3/4 of the "Core Devs" present at this round-table?

What are they trying to prove by leaving their name out?